(A) wavelength-scale SOI microdisk exceptional point filter based on two unequal scatterers = 두 개의 산란체를 기반으로 하는 파장 크기의 마이크로 디스크 공진기를 이용한 익셉셔널 광학 필터

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The appearance of exceptional point involving the coalescence of both eigenvalues and eigenfunctions of non-Hermitian Hamiltonian in an open quantum system is investigated in a resonator-waveguide system. In particular, asymmetric backscattering in a two-port optical filter is observed using Finite Element Method (FEM) and Finite-Difference Time-Domain (FDTD) numerical simulations with only two unequal Rayleigh scatterers placed at certain lateral positions in the evanescent field of the cavity on silicon-on-insulator (SOI) platform. Field incidence that adheres to the structure’s chirality causes the incident photons to ‘tunnel through’ along the resonator as though the scatterers are absent. Incidence at the opposite port however induces significant backreflection which field is then coupled back to the input port. The backscattering at the input port suggests the existence of a simultaneous ‘drop’ port without introducing a second waveguide; besides being asymmetric in behavior at exceptional point contrary to the current typical filters. While the ‘through’ port remains steadily unruffled and symmetric, the backscattering can be fine-tuned by simply shifting one of the scatterers, which to a certain displacement extent exhibit a complete reversal of asymmetric behavior at the ports. Rigorous theoretical model based on the temporal coupled mode theory framework is developed to set the governing dynamical properties of the filter system. This work introduces a novel form of filter, which is proposed as the ‘Exceptional Point Filter’ with concurrently symmetric and asymmetric ports; and can be a new addition to the current family of filters we have today.
Advisors
Yu, Kyoungsikresearcher유경식researcher
Description
한국과학기술원 :전기및전자공학과,
Publisher
한국과학기술원
Issue Date
2015
Identifier
325007
Language
eng
Description

학위논문(석사) - 한국과학기술원 : 전기및전자공학과, 2015.2 ,[vii, 23 p. :]

Keywords

Filter; Microresonator; Chirality; Optics; 익셉셔널 광학; 필터; 마이크로디스크; 키랄성; 광학; Exceptional Point

URI
http://hdl.handle.net/10203/221756
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=657588&flag=dissertation
Appears in Collection
EE-Theses_Master(석사논문)
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