Modelling Of Graphene Based Multimode Interference Waveguide As A Refractive Index Optical Sensor

Modelling Of Graphene Based Multimode Interference Waveguide As A Refractive Index Optical Sensor

Over the recent years, demands for compact, portable, sensitive and easy to fabricate sensing devices have grown rapidly for industrial, medical and environmental applications. However, it remains a challenge to miniaturise the device while ensuring high sensitivity and efficient sensing in a wide r...

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Main Author: Yeoh, Stephenie
Format: Thesis
Language:English
Published: 2022
Subjects:
QC1 Physics (General)
Online Access:http://eprints.usm.my/59804/1/24%20Pages%20from%20STEPHENIE%20YEOH.pdf
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spelling my-usm-ep.598042024-02-05T01:11:30Z Modelling Of Graphene Based Multimode Interference Waveguide As A Refractive Index Optical Sensor 2022-09 Yeoh, Stephenie QC1 Physics (General) Over the recent years, demands for compact, portable, sensitive and easy to fabricate sensing devices have grown rapidly for industrial, medical and environmental applications. However, it remains a challenge to miniaturise the device while ensuring high sensitivity and efficient sensing in a wide range of wavelength. The state-of-the-art devices suffer from high losses and narrow detection range of analytes at the near-infrared (NIR) spectral regions. This research overcomes these issues by integrating graphene on a multimode interference (MMI) structure which is composed of a dielectric planar waveguide confined by a substrate and a cladding layer. The high refractive index (RI) of graphene layer of 2.345 causes the modes to be less confined in the core region. The enhancement of evanescent field on the surface of the waveguide results in higher sensitivity to changing RI in surrounding medium. The dispersion relation of transverse magnetic (TM) modes is derived from Maxwell’s equations to investigate the impact of the geometric and optical parameters including thickness, conductivity and refractive indices. Graphene is modelled as a homogeneous film with finite thickness to investigate the sensitivity of the effective refractive index 2022-09 Thesis http://eprints.usm.my/59804/ http://eprints.usm.my/59804/1/24%20Pages%20from%20STEPHENIE%20YEOH.pdf application/pdf en public phd doctoral Perpustakaan Hamzah Sendut Pusat Pengajian Sains Fizik
institution Universiti Sains Malaysia
collection USM Institutional Repository
language English
topic QC1 Physics (General)
spellingShingle QC1 Physics (General)
Yeoh, Stephenie
Modelling Of Graphene Based Multimode Interference Waveguide As A Refractive Index Optical Sensor
description Over the recent years, demands for compact, portable, sensitive and easy to fabricate sensing devices have grown rapidly for industrial, medical and environmental applications. However, it remains a challenge to miniaturise the device while ensuring high sensitivity and efficient sensing in a wide range of wavelength. The state-of-the-art devices suffer from high losses and narrow detection range of analytes at the near-infrared (NIR) spectral regions. This research overcomes these issues by integrating graphene on a multimode interference (MMI) structure which is composed of a dielectric planar waveguide confined by a substrate and a cladding layer. The high refractive index (RI) of graphene layer of 2.345 causes the modes to be less confined in the core region. The enhancement of evanescent field on the surface of the waveguide results in higher sensitivity to changing RI in surrounding medium. The dispersion relation of transverse magnetic (TM) modes is derived from Maxwell’s equations to investigate the impact of the geometric and optical parameters including thickness, conductivity and refractive indices. Graphene is modelled as a homogeneous film with finite thickness to investigate the sensitivity of the effective refractive index
format Thesis
qualification_name Doctor of Philosophy (PhD.)
qualification_level Doctorate
author Yeoh, Stephenie
author_facet Yeoh, Stephenie
author_sort Yeoh, Stephenie
title Modelling Of Graphene Based Multimode Interference Waveguide As A Refractive Index Optical Sensor
title_short Modelling Of Graphene Based Multimode Interference Waveguide As A Refractive Index Optical Sensor
title_full Modelling Of Graphene Based Multimode Interference Waveguide As A Refractive Index Optical Sensor
title_fullStr Modelling Of Graphene Based Multimode Interference Waveguide As A Refractive Index Optical Sensor
title_full_unstemmed Modelling Of Graphene Based Multimode Interference Waveguide As A Refractive Index Optical Sensor
title_sort modelling of graphene based multimode interference waveguide as a refractive index optical sensor
granting_institution Perpustakaan Hamzah Sendut
granting_department Pusat Pengajian Sains Fizik
publishDate 2022
url http://eprints.usm.my/59804/1/24%20Pages%20from%20STEPHENIE%20YEOH.pdf
_version_ 1794024059318566912

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