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Plasmonic Waveguide Coupled Ring Cavity for a Non-Resonant Type Refractive Index Sensor
Sensitive refractive index sensors with small footprints have been studied to allow the integration of a large number of sensors into a tiny chip for bio/chemical applications. In particular, resonant-type index sensors based on various micro/nanocavities, which use a resonant wavelength dependence...
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Formato: | Online Artículo Texto |
Lenguaje: | English |
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MDPI
2017
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Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5713189/ https://www.ncbi.nlm.nih.gov/pubmed/29099740 http://dx.doi.org/10.3390/s17112526 |
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author | Kwon, Soon-Hong |
author_facet | Kwon, Soon-Hong |
author_sort | Kwon, Soon-Hong |
collection | PubMed |
description | Sensitive refractive index sensors with small footprints have been studied to allow the integration of a large number of sensors into a tiny chip for bio/chemical applications. In particular, resonant-type index sensors based on various micro/nanocavities, which use a resonant wavelength dependence on the refractive index of the analyte, have been developed. However, the spectral linewidth of the resonance, which becomes the resolution limit, is considerably large in plasmonic cavities due to the large absorption loss of metals. Therefore, there is demand for a new type of plasmonic refractive index sensor that is not limited by the linewidth of the cavity. We propose a new type of plasmonic index sensors consisting of a channel waveguide and a ring cavity. Two emissions from the ring cavity in both directions of the waveguide couple with a reflection phase difference depending on the length of a closed right arm with a reflecting boundary. Therefore, the output power dramatically and sensitively changes as a function of the refractive index of the analyte filling the waveguide. |
format | Online Article Text |
id | pubmed-5713189 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2017 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
spelling | pubmed-57131892017-12-07 Plasmonic Waveguide Coupled Ring Cavity for a Non-Resonant Type Refractive Index Sensor Kwon, Soon-Hong Sensors (Basel) Article Sensitive refractive index sensors with small footprints have been studied to allow the integration of a large number of sensors into a tiny chip for bio/chemical applications. In particular, resonant-type index sensors based on various micro/nanocavities, which use a resonant wavelength dependence on the refractive index of the analyte, have been developed. However, the spectral linewidth of the resonance, which becomes the resolution limit, is considerably large in plasmonic cavities due to the large absorption loss of metals. Therefore, there is demand for a new type of plasmonic refractive index sensor that is not limited by the linewidth of the cavity. We propose a new type of plasmonic index sensors consisting of a channel waveguide and a ring cavity. Two emissions from the ring cavity in both directions of the waveguide couple with a reflection phase difference depending on the length of a closed right arm with a reflecting boundary. Therefore, the output power dramatically and sensitively changes as a function of the refractive index of the analyte filling the waveguide. MDPI 2017-11-03 /pmc/articles/PMC5713189/ /pubmed/29099740 http://dx.doi.org/10.3390/s17112526 Text en © 2017 by the author. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/). |
spellingShingle | Article Kwon, Soon-Hong Plasmonic Waveguide Coupled Ring Cavity for a Non-Resonant Type Refractive Index Sensor |
title | Plasmonic Waveguide Coupled Ring Cavity for a Non-Resonant Type Refractive Index Sensor |
title_full | Plasmonic Waveguide Coupled Ring Cavity for a Non-Resonant Type Refractive Index Sensor |
title_fullStr | Plasmonic Waveguide Coupled Ring Cavity for a Non-Resonant Type Refractive Index Sensor |
title_full_unstemmed | Plasmonic Waveguide Coupled Ring Cavity for a Non-Resonant Type Refractive Index Sensor |
title_short | Plasmonic Waveguide Coupled Ring Cavity for a Non-Resonant Type Refractive Index Sensor |
title_sort | plasmonic waveguide coupled ring cavity for a non-resonant type refractive index sensor |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5713189/ https://www.ncbi.nlm.nih.gov/pubmed/29099740 http://dx.doi.org/10.3390/s17112526 |
work_keys_str_mv | AT kwonsoonhong plasmonicwaveguidecoupledringcavityforanonresonanttyperefractiveindexsensor |