Electric field enhancement and far-field radiation pattern of the nanoantenna with concentric rings

Abstract The optical antennas have the potential in various applications because of their field enhancement and directivity control. The directivity of a dipole antenna can be improved by directivity-enhanced Raman scattering structure, which is a combination of a dipole antenna and a ring reflector...
Ausführliche Beschreibung

Gespeichert in:

Autor*in:	Chen, Shih-Wen [verfasserIn] Huang, Yi-Han [verfasserIn] Chao, Bo-Kai [verfasserIn] Hsueh, Chun-Hway [verfasserIn] Li, Jia-Han [verfasserIn]

Format:	E-Artikel
Sprache:	Englisch

Erschienen:	2014

Schlagwörter:	Plasmonics Nanoantennas Far-field radiation pattern Electric field enhancement Surface-enhanced Raman scattering

Übergeordnetes Werk:	Enthalten in: Nanoscale research letters - New York, NY [u.a.] : Springer, 2006, 9(2014), 1 vom: 17. Dez.
Übergeordnetes Werk:	volume:9 ; year:2014 ; number:1 ; day:17 ; month:12

Links:	Volltext

DOI / URN:	10.1186/1556-276X-9-681

Katalog-ID:	SPR021893918

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520			\|a Abstract The optical antennas have the potential in various applications because of their field enhancement and directivity control. The directivity of a dipole antenna can be improved by directivity-enhanced Raman scattering structure, which is a combination of a dipole antenna and a ring reflector layer on a ground plane. The concentric rings can collect the light into the center hole. Depending upon the geometry of the antenna inside the hole, different electric field enhancements can be achieved. In this paper, we propose to combine the concentric rings with the directivity-enhanced Raman scattering structure in order to study its electric field enhancement and the far-field radiation pattern by finite-difference time-domain simulations. Compared with the structure without the concentric rings over the ground plane, it is found that our proposed structure can obtain stronger electric field enhancements and narrower radiation beams because the gold rings can help to couple the light into the nanoantenna and they also scatter light into the far field and modify the far-field radiation pattern. The designed structures were fabricated and the chemical molecules of thiophenol were attached on the structures for surface-enhanced Raman scattering (SERS) measurements. The measured results show that the structure with concentric rings can have stronger SERS signals. The effects of the dielectric layer thickness in our proposed structure on the near-field enhancements and far-field radiation are also investigated. The proposed structure can be useful for several nanoantenna applications, such as sensing or detecting.
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allfields	10.1186/1556-276X-9-681 doi (DE-627)SPR021893918 (SPR)1556-276X-9-681-e DE-627 ger DE-627 rakwb eng 600 ASE Chen, Shih-Wen verfasserin aut Electric field enhancement and far-field radiation pattern of the nanoantenna with concentric rings 2014 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Abstract The optical antennas have the potential in various applications because of their field enhancement and directivity control. The directivity of a dipole antenna can be improved by directivity-enhanced Raman scattering structure, which is a combination of a dipole antenna and a ring reflector layer on a ground plane. The concentric rings can collect the light into the center hole. Depending upon the geometry of the antenna inside the hole, different electric field enhancements can be achieved. In this paper, we propose to combine the concentric rings with the directivity-enhanced Raman scattering structure in order to study its electric field enhancement and the far-field radiation pattern by finite-difference time-domain simulations. Compared with the structure without the concentric rings over the ground plane, it is found that our proposed structure can obtain stronger electric field enhancements and narrower radiation beams because the gold rings can help to couple the light into the nanoantenna and they also scatter light into the far field and modify the far-field radiation pattern. The designed structures were fabricated and the chemical molecules of thiophenol were attached on the structures for surface-enhanced Raman scattering (SERS) measurements. The measured results show that the structure with concentric rings can have stronger SERS signals. The effects of the dielectric layer thickness in our proposed structure on the near-field enhancements and far-field radiation are also investigated. The proposed structure can be useful for several nanoantenna applications, such as sensing or detecting. Plasmonics (dpeaa)DE-He213 Nanoantennas (dpeaa)DE-He213 Far-field radiation pattern (dpeaa)DE-He213 Electric field enhancement (dpeaa)DE-He213 Surface-enhanced Raman scattering (dpeaa)DE-He213 Huang, Yi-Han verfasserin aut Chao, Bo-Kai verfasserin aut Hsueh, Chun-Hway verfasserin aut Li, Jia-Han verfasserin aut Enthalten in Nanoscale research letters New York, NY [u.a.] : Springer, 2006 9(2014), 1 vom: 17. Dez. (DE-627)518632474 (DE-600)2253244-4 1556-276X nnns volume:9 year:2014 number:1 day:17 month:12 https://dx.doi.org/10.1186/1556-276X-9-681 kostenfrei Volltext GBV_USEFLAG_A SYSFLAG_A GBV_SPRINGER GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_2014 GBV_ILN_2027 GBV_ILN_2055 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 9 2014 1 17 12
spelling	10.1186/1556-276X-9-681 doi (DE-627)SPR021893918 (SPR)1556-276X-9-681-e DE-627 ger DE-627 rakwb eng 600 ASE Chen, Shih-Wen verfasserin aut Electric field enhancement and far-field radiation pattern of the nanoantenna with concentric rings 2014 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Abstract The optical antennas have the potential in various applications because of their field enhancement and directivity control. The directivity of a dipole antenna can be improved by directivity-enhanced Raman scattering structure, which is a combination of a dipole antenna and a ring reflector layer on a ground plane. The concentric rings can collect the light into the center hole. Depending upon the geometry of the antenna inside the hole, different electric field enhancements can be achieved. In this paper, we propose to combine the concentric rings with the directivity-enhanced Raman scattering structure in order to study its electric field enhancement and the far-field radiation pattern by finite-difference time-domain simulations. Compared with the structure without the concentric rings over the ground plane, it is found that our proposed structure can obtain stronger electric field enhancements and narrower radiation beams because the gold rings can help to couple the light into the nanoantenna and they also scatter light into the far field and modify the far-field radiation pattern. The designed structures were fabricated and the chemical molecules of thiophenol were attached on the structures for surface-enhanced Raman scattering (SERS) measurements. The measured results show that the structure with concentric rings can have stronger SERS signals. The effects of the dielectric layer thickness in our proposed structure on the near-field enhancements and far-field radiation are also investigated. The proposed structure can be useful for several nanoantenna applications, such as sensing or detecting. Plasmonics (dpeaa)DE-He213 Nanoantennas (dpeaa)DE-He213 Far-field radiation pattern (dpeaa)DE-He213 Electric field enhancement (dpeaa)DE-He213 Surface-enhanced Raman scattering (dpeaa)DE-He213 Huang, Yi-Han verfasserin aut Chao, Bo-Kai verfasserin aut Hsueh, Chun-Hway verfasserin aut Li, Jia-Han verfasserin aut Enthalten in Nanoscale research letters New York, NY [u.a.] : Springer, 2006 9(2014), 1 vom: 17. Dez. (DE-627)518632474 (DE-600)2253244-4 1556-276X nnns volume:9 year:2014 number:1 day:17 month:12 https://dx.doi.org/10.1186/1556-276X-9-681 kostenfrei Volltext GBV_USEFLAG_A SYSFLAG_A GBV_SPRINGER GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_2014 GBV_ILN_2027 GBV_ILN_2055 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 9 2014 1 17 12
allfields_unstemmed	10.1186/1556-276X-9-681 doi (DE-627)SPR021893918 (SPR)1556-276X-9-681-e DE-627 ger DE-627 rakwb eng 600 ASE Chen, Shih-Wen verfasserin aut Electric field enhancement and far-field radiation pattern of the nanoantenna with concentric rings 2014 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Abstract The optical antennas have the potential in various applications because of their field enhancement and directivity control. The directivity of a dipole antenna can be improved by directivity-enhanced Raman scattering structure, which is a combination of a dipole antenna and a ring reflector layer on a ground plane. The concentric rings can collect the light into the center hole. Depending upon the geometry of the antenna inside the hole, different electric field enhancements can be achieved. In this paper, we propose to combine the concentric rings with the directivity-enhanced Raman scattering structure in order to study its electric field enhancement and the far-field radiation pattern by finite-difference time-domain simulations. Compared with the structure without the concentric rings over the ground plane, it is found that our proposed structure can obtain stronger electric field enhancements and narrower radiation beams because the gold rings can help to couple the light into the nanoantenna and they also scatter light into the far field and modify the far-field radiation pattern. The designed structures were fabricated and the chemical molecules of thiophenol were attached on the structures for surface-enhanced Raman scattering (SERS) measurements. The measured results show that the structure with concentric rings can have stronger SERS signals. The effects of the dielectric layer thickness in our proposed structure on the near-field enhancements and far-field radiation are also investigated. The proposed structure can be useful for several nanoantenna applications, such as sensing or detecting. Plasmonics (dpeaa)DE-He213 Nanoantennas (dpeaa)DE-He213 Far-field radiation pattern (dpeaa)DE-He213 Electric field enhancement (dpeaa)DE-He213 Surface-enhanced Raman scattering (dpeaa)DE-He213 Huang, Yi-Han verfasserin aut Chao, Bo-Kai verfasserin aut Hsueh, Chun-Hway verfasserin aut Li, Jia-Han verfasserin aut Enthalten in Nanoscale research letters New York, NY [u.a.] : Springer, 2006 9(2014), 1 vom: 17. Dez. (DE-627)518632474 (DE-600)2253244-4 1556-276X nnns volume:9 year:2014 number:1 day:17 month:12 https://dx.doi.org/10.1186/1556-276X-9-681 kostenfrei Volltext GBV_USEFLAG_A SYSFLAG_A GBV_SPRINGER GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_2014 GBV_ILN_2027 GBV_ILN_2055 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 9 2014 1 17 12
allfieldsGer	10.1186/1556-276X-9-681 doi (DE-627)SPR021893918 (SPR)1556-276X-9-681-e DE-627 ger DE-627 rakwb eng 600 ASE Chen, Shih-Wen verfasserin aut Electric field enhancement and far-field radiation pattern of the nanoantenna with concentric rings 2014 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Abstract The optical antennas have the potential in various applications because of their field enhancement and directivity control. The directivity of a dipole antenna can be improved by directivity-enhanced Raman scattering structure, which is a combination of a dipole antenna and a ring reflector layer on a ground plane. The concentric rings can collect the light into the center hole. Depending upon the geometry of the antenna inside the hole, different electric field enhancements can be achieved. In this paper, we propose to combine the concentric rings with the directivity-enhanced Raman scattering structure in order to study its electric field enhancement and the far-field radiation pattern by finite-difference time-domain simulations. Compared with the structure without the concentric rings over the ground plane, it is found that our proposed structure can obtain stronger electric field enhancements and narrower radiation beams because the gold rings can help to couple the light into the nanoantenna and they also scatter light into the far field and modify the far-field radiation pattern. The designed structures were fabricated and the chemical molecules of thiophenol were attached on the structures for surface-enhanced Raman scattering (SERS) measurements. The measured results show that the structure with concentric rings can have stronger SERS signals. The effects of the dielectric layer thickness in our proposed structure on the near-field enhancements and far-field radiation are also investigated. The proposed structure can be useful for several nanoantenna applications, such as sensing or detecting. Plasmonics (dpeaa)DE-He213 Nanoantennas (dpeaa)DE-He213 Far-field radiation pattern (dpeaa)DE-He213 Electric field enhancement (dpeaa)DE-He213 Surface-enhanced Raman scattering (dpeaa)DE-He213 Huang, Yi-Han verfasserin aut Chao, Bo-Kai verfasserin aut Hsueh, Chun-Hway verfasserin aut Li, Jia-Han verfasserin aut Enthalten in Nanoscale research letters New York, NY [u.a.] : Springer, 2006 9(2014), 1 vom: 17. Dez. (DE-627)518632474 (DE-600)2253244-4 1556-276X nnns volume:9 year:2014 number:1 day:17 month:12 https://dx.doi.org/10.1186/1556-276X-9-681 kostenfrei Volltext GBV_USEFLAG_A SYSFLAG_A GBV_SPRINGER GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_2014 GBV_ILN_2027 GBV_ILN_2055 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 9 2014 1 17 12
allfieldsSound	10.1186/1556-276X-9-681 doi (DE-627)SPR021893918 (SPR)1556-276X-9-681-e DE-627 ger DE-627 rakwb eng 600 ASE Chen, Shih-Wen verfasserin aut Electric field enhancement and far-field radiation pattern of the nanoantenna with concentric rings 2014 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Abstract The optical antennas have the potential in various applications because of their field enhancement and directivity control. The directivity of a dipole antenna can be improved by directivity-enhanced Raman scattering structure, which is a combination of a dipole antenna and a ring reflector layer on a ground plane. The concentric rings can collect the light into the center hole. Depending upon the geometry of the antenna inside the hole, different electric field enhancements can be achieved. In this paper, we propose to combine the concentric rings with the directivity-enhanced Raman scattering structure in order to study its electric field enhancement and the far-field radiation pattern by finite-difference time-domain simulations. Compared with the structure without the concentric rings over the ground plane, it is found that our proposed structure can obtain stronger electric field enhancements and narrower radiation beams because the gold rings can help to couple the light into the nanoantenna and they also scatter light into the far field and modify the far-field radiation pattern. The designed structures were fabricated and the chemical molecules of thiophenol were attached on the structures for surface-enhanced Raman scattering (SERS) measurements. The measured results show that the structure with concentric rings can have stronger SERS signals. The effects of the dielectric layer thickness in our proposed structure on the near-field enhancements and far-field radiation are also investigated. The proposed structure can be useful for several nanoantenna applications, such as sensing or detecting. Plasmonics (dpeaa)DE-He213 Nanoantennas (dpeaa)DE-He213 Far-field radiation pattern (dpeaa)DE-He213 Electric field enhancement (dpeaa)DE-He213 Surface-enhanced Raman scattering (dpeaa)DE-He213 Huang, Yi-Han verfasserin aut Chao, Bo-Kai verfasserin aut Hsueh, Chun-Hway verfasserin aut Li, Jia-Han verfasserin aut Enthalten in Nanoscale research letters New York, NY [u.a.] : Springer, 2006 9(2014), 1 vom: 17. Dez. (DE-627)518632474 (DE-600)2253244-4 1556-276X nnns volume:9 year:2014 number:1 day:17 month:12 https://dx.doi.org/10.1186/1556-276X-9-681 kostenfrei Volltext GBV_USEFLAG_A SYSFLAG_A GBV_SPRINGER GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_2014 GBV_ILN_2027 GBV_ILN_2055 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 9 2014 1 17 12
language	English
source	Enthalten in Nanoscale research letters 9(2014), 1 vom: 17. Dez. volume:9 year:2014 number:1 day:17 month:12
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topic_facet	Plasmonics Nanoantennas Far-field radiation pattern Electric field enhancement Surface-enhanced Raman scattering
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container_title	Nanoscale research letters
authorswithroles_txt_mv	Chen, Shih-Wen @@aut@@ Huang, Yi-Han @@aut@@ Chao, Bo-Kai @@aut@@ Hsueh, Chun-Hway @@aut@@ Li, Jia-Han @@aut@@
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author	Chen, Shih-Wen
spellingShingle	Chen, Shih-Wen ddc 600 misc Plasmonics misc Nanoantennas misc Far-field radiation pattern misc Electric field enhancement misc Surface-enhanced Raman scattering Electric field enhancement and far-field radiation pattern of the nanoantenna with concentric rings
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topic_title	600 ASE Electric field enhancement and far-field radiation pattern of the nanoantenna with concentric rings Plasmonics (dpeaa)DE-He213 Nanoantennas (dpeaa)DE-He213 Far-field radiation pattern (dpeaa)DE-He213 Electric field enhancement (dpeaa)DE-He213 Surface-enhanced Raman scattering (dpeaa)DE-He213
topic	ddc 600 misc Plasmonics misc Nanoantennas misc Far-field radiation pattern misc Electric field enhancement misc Surface-enhanced Raman scattering
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title	Electric field enhancement and far-field radiation pattern of the nanoantenna with concentric rings
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title_full	Electric field enhancement and far-field radiation pattern of the nanoantenna with concentric rings
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title_sort	electric field enhancement and far-field radiation pattern of the nanoantenna with concentric rings
title_auth	Electric field enhancement and far-field radiation pattern of the nanoantenna with concentric rings
abstract	Abstract The optical antennas have the potential in various applications because of their field enhancement and directivity control. The directivity of a dipole antenna can be improved by directivity-enhanced Raman scattering structure, which is a combination of a dipole antenna and a ring reflector layer on a ground plane. The concentric rings can collect the light into the center hole. Depending upon the geometry of the antenna inside the hole, different electric field enhancements can be achieved. In this paper, we propose to combine the concentric rings with the directivity-enhanced Raman scattering structure in order to study its electric field enhancement and the far-field radiation pattern by finite-difference time-domain simulations. Compared with the structure without the concentric rings over the ground plane, it is found that our proposed structure can obtain stronger electric field enhancements and narrower radiation beams because the gold rings can help to couple the light into the nanoantenna and they also scatter light into the far field and modify the far-field radiation pattern. The designed structures were fabricated and the chemical molecules of thiophenol were attached on the structures for surface-enhanced Raman scattering (SERS) measurements. The measured results show that the structure with concentric rings can have stronger SERS signals. The effects of the dielectric layer thickness in our proposed structure on the near-field enhancements and far-field radiation are also investigated. The proposed structure can be useful for several nanoantenna applications, such as sensing or detecting.
abstractGer	Abstract The optical antennas have the potential in various applications because of their field enhancement and directivity control. The directivity of a dipole antenna can be improved by directivity-enhanced Raman scattering structure, which is a combination of a dipole antenna and a ring reflector layer on a ground plane. The concentric rings can collect the light into the center hole. Depending upon the geometry of the antenna inside the hole, different electric field enhancements can be achieved. In this paper, we propose to combine the concentric rings with the directivity-enhanced Raman scattering structure in order to study its electric field enhancement and the far-field radiation pattern by finite-difference time-domain simulations. Compared with the structure without the concentric rings over the ground plane, it is found that our proposed structure can obtain stronger electric field enhancements and narrower radiation beams because the gold rings can help to couple the light into the nanoantenna and they also scatter light into the far field and modify the far-field radiation pattern. The designed structures were fabricated and the chemical molecules of thiophenol were attached on the structures for surface-enhanced Raman scattering (SERS) measurements. The measured results show that the structure with concentric rings can have stronger SERS signals. The effects of the dielectric layer thickness in our proposed structure on the near-field enhancements and far-field radiation are also investigated. The proposed structure can be useful for several nanoantenna applications, such as sensing or detecting.
abstract_unstemmed	Abstract The optical antennas have the potential in various applications because of their field enhancement and directivity control. The directivity of a dipole antenna can be improved by directivity-enhanced Raman scattering structure, which is a combination of a dipole antenna and a ring reflector layer on a ground plane. The concentric rings can collect the light into the center hole. Depending upon the geometry of the antenna inside the hole, different electric field enhancements can be achieved. In this paper, we propose to combine the concentric rings with the directivity-enhanced Raman scattering structure in order to study its electric field enhancement and the far-field radiation pattern by finite-difference time-domain simulations. Compared with the structure without the concentric rings over the ground plane, it is found that our proposed structure can obtain stronger electric field enhancements and narrower radiation beams because the gold rings can help to couple the light into the nanoantenna and they also scatter light into the far field and modify the far-field radiation pattern. The designed structures were fabricated and the chemical molecules of thiophenol were attached on the structures for surface-enhanced Raman scattering (SERS) measurements. The measured results show that the structure with concentric rings can have stronger SERS signals. The effects of the dielectric layer thickness in our proposed structure on the near-field enhancements and far-field radiation are also investigated. The proposed structure can be useful for several nanoantenna applications, such as sensing or detecting.
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title_short	Electric field enhancement and far-field radiation pattern of the nanoantenna with concentric rings
url	https://dx.doi.org/10.1186/1556-276X-9-681
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author2	Huang, Yi-Han Chao, Bo-Kai Hsueh, Chun-Hway Li, Jia-Han
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up_date	2024-07-04T00:54:33.463Z
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Electric field enhancement and far-field radiation pattern of the nanoantenna with concentric rings

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