Investigation of Grating-Assisted Trimodal Interferometer Biosensors Based on a Polymer Platform
A grating-assisted trimodal interferometer biosensor is proposed and numerically analyzed. A long period grating coupler, for adjusting the power between the fundamental mode and the second higher order mode, is investigated, and is shown to act as a conventional directional coupler for adjusting th...
Main Authors: | , , , |
---|---|
Format: | Article |
Language: | English |
Published: |
MDPI AG
2018-05-01
|
Series: | Sensors |
Subjects: | |
Online Access: | http://www.mdpi.com/1424-8220/18/5/1502 |
id |
doaj-168b6f0ecd4c4299a0e46731ff562106 |
---|---|
record_format |
Article |
spelling |
doaj-168b6f0ecd4c4299a0e46731ff5621062020-11-25T00:54:55ZengMDPI AGSensors1424-82202018-05-01185150210.3390/s18051502s18051502Investigation of Grating-Assisted Trimodal Interferometer Biosensors Based on a Polymer PlatformYuxin Liang0Mingshan Zhao1Zhenlin Wu2Geert Morthier3Photonics Research Group, Department of Information and Technology, Ghent University, 9000 Ghent, BelgiumSchool of Physics and Optoelectronic Engineering, Dalian University of Technology, Dalian116023, ChinaSchool of Physics and Optoelectronic Engineering, Dalian University of Technology, Dalian116023, ChinaPhotonics Research Group, Department of Information and Technology, Ghent University, 9000 Ghent, BelgiumA grating-assisted trimodal interferometer biosensor is proposed and numerically analyzed. A long period grating coupler, for adjusting the power between the fundamental mode and the second higher order mode, is investigated, and is shown to act as a conventional directional coupler for adjusting the power between the two arms. The trimodal interferometer can achieve maximal fringe visibility when the powers of the two modes are adjusted to the same value by the grating coupler, which means that a better limit of detection can be expected. In addition, the second higher order mode typically has a larger evanescent tail than the first higher order mode in bimodal interferometers, resulting in a higher sensitivity of the trimodal interferometer. The influence of fabrication tolerances on the performance of the designed interferometer is also investigated. The power difference between the two modes shows inertia to the fill factor of the grating, but high sensitivity to the modulation depth. Finally, a 2050 2π/RIU (refractive index unit) sensitivity and 43 dB extinction ratio of the output power are achieved.http://www.mdpi.com/1424-8220/18/5/1502trimodal waveguidebiosensorslong period gratingpolymer waveguide |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Yuxin Liang Mingshan Zhao Zhenlin Wu Geert Morthier |
spellingShingle |
Yuxin Liang Mingshan Zhao Zhenlin Wu Geert Morthier Investigation of Grating-Assisted Trimodal Interferometer Biosensors Based on a Polymer Platform Sensors trimodal waveguide biosensors long period grating polymer waveguide |
author_facet |
Yuxin Liang Mingshan Zhao Zhenlin Wu Geert Morthier |
author_sort |
Yuxin Liang |
title |
Investigation of Grating-Assisted Trimodal Interferometer Biosensors Based on a Polymer Platform |
title_short |
Investigation of Grating-Assisted Trimodal Interferometer Biosensors Based on a Polymer Platform |
title_full |
Investigation of Grating-Assisted Trimodal Interferometer Biosensors Based on a Polymer Platform |
title_fullStr |
Investigation of Grating-Assisted Trimodal Interferometer Biosensors Based on a Polymer Platform |
title_full_unstemmed |
Investigation of Grating-Assisted Trimodal Interferometer Biosensors Based on a Polymer Platform |
title_sort |
investigation of grating-assisted trimodal interferometer biosensors based on a polymer platform |
publisher |
MDPI AG |
series |
Sensors |
issn |
1424-8220 |
publishDate |
2018-05-01 |
description |
A grating-assisted trimodal interferometer biosensor is proposed and numerically analyzed. A long period grating coupler, for adjusting the power between the fundamental mode and the second higher order mode, is investigated, and is shown to act as a conventional directional coupler for adjusting the power between the two arms. The trimodal interferometer can achieve maximal fringe visibility when the powers of the two modes are adjusted to the same value by the grating coupler, which means that a better limit of detection can be expected. In addition, the second higher order mode typically has a larger evanescent tail than the first higher order mode in bimodal interferometers, resulting in a higher sensitivity of the trimodal interferometer. The influence of fabrication tolerances on the performance of the designed interferometer is also investigated. The power difference between the two modes shows inertia to the fill factor of the grating, but high sensitivity to the modulation depth. Finally, a 2050 2π/RIU (refractive index unit) sensitivity and 43 dB extinction ratio of the output power are achieved. |
topic |
trimodal waveguide biosensors long period grating polymer waveguide |
url |
http://www.mdpi.com/1424-8220/18/5/1502 |
work_keys_str_mv |
AT yuxinliang investigationofgratingassistedtrimodalinterferometerbiosensorsbasedonapolymerplatform AT mingshanzhao investigationofgratingassistedtrimodalinterferometerbiosensorsbasedonapolymerplatform AT zhenlinwu investigationofgratingassistedtrimodalinterferometerbiosensorsbasedonapolymerplatform AT geertmorthier investigationofgratingassistedtrimodalinterferometerbiosensorsbasedonapolymerplatform |
_version_ |
1725232623709585408 |