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SCI Article

Time-asymmetric loop around an exceptional point over the full optical communications band
성명 송석호()
소속 자연과학대학 물리학과
캠퍼스
우수선정주 2018년 10월 5째주
Author Yoon, Jae Woong (Dept Phys); Choi, Youngsun (Dept Phys); Kim, Gunpyo (Dept Phys); 송석호 (Dept Phys) corresponding author;
Corresponding Author Info Song, SH (reprint author), Hanyang Univ, Dept Phys, Seoul, South Korea.
E-mail 이메일 아이콘shsong@hanyang.ac.kr
Document Type Article
Source NATURE Volume:562 Issue:7725 Pages:86-+ Published:2018
Times Cited 0
External Information http://dx.doi.org/10.1038/s41586-018-0523-2
Abstract Topological operations around exceptional points(1-8)-time-varying system configurations associated with non-Hermitian singularities-have been proposed as a robust approach to achieving far-reaching open-system dynamics, as demonstrated in highly dissipative microwave transmission(3) and cryogenic optomechanical oscillator(4) experiments. In stark contrast to conventional systems based on closed-system Hermitian dynamics, environmental interferences at exceptional points are dynamically engaged with their internal coupling properties to create rotational stimuli in fictitious-parameter domains, resulting in chiral systems that exhibit various anomalous physical phenomena(9-16). To achieve new wave properties and concomitant device architectures to control them, realizations of such systems in application-abundant technological areas, including communications and signal processing systems, are the next step. However, it is currently unclear whether non-Hermitian interaction schemes can be configured in robust technological platforms for further device engineering. Here we experimentally demonstrate a robust silicon photonic structure with photonic modes that transmit through time-asymmetric loops around an exceptional point in the optical domain. The proposed structure consists of two coupled silicon-channel waveguides and a slab-waveguide leakage-radiation sink that precisely control the required non-Hermitian Hamiltonian experienced by the photonic modes. The fabricated devices generate time-asymmetric light transmission over an extremely broad spectral band covering the entire optical telecommunications window (wavelengths between 1.26 and 1.675 micrometres). Thus, we take a step towards broadband on-chip optical devices based on non-Hermitian topological dynamics by using a semiconductor platform with controllable optoelectronic properties, and towards several potential practical applications, such as on-chip optical isolators and non-reciprocal mode converters. Our results further suggest the technological relevance of non-Hermitian wave dynamics in various other branches of physics, such as acoustics, condensed-matter physics and quantum mechanics.
Web of Science Categories Multidisciplinary Sciences
Funding Global Frontier Program of the National Research Foundation (NRF) of Korea - Ministry of Science, ICT & Future Planning [NRF-2014M3A6B3063708]; Basic Science Research Program [NRF-2015R1A2A2A01007553]; Presidential Post-Doc Fellowship Program [NRF-2017R1A
Language English
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