Observation of topological large-area pseudospin-momentum locking waveguide states

Liu He; Jianquan Yao

doi:10.1117/12.3035175

20 November 2024 Observation of topological large-area pseudospin-momentum locking waveguide states

Liu He, Jianquan Yao

Proceedings Volume 13244, Nano-optoelectronics and Micro/Nano-photonics X; 132440D (2024) https://doi.org/10.1117/12.3035175
Event: SPIE/COS Photonics Asia, 2024, Nantong, Jiangsu, China

Abstract

Unlike conventional topological edge states confined at a domain wall between two topologically distinct media, the recently proposed large-area topological waveguide states in three-layer heterostructures, which consist of a domain featuring Dirac points sandwiched between two domains of different topologies, have introduced the mode width degree of freedom for more flexible manipulation of electromagnetic waves. Up to now, the experimental realizations of photonic large-area topological waveguide states are exclusively based on quantum Hall and quantum valley-Hall systems. In this work, we propose a new way to create large-area topological waveguide states based on photonic quantum spin-Hall system and observe their unique feature of pseudospin-momentum locking unidirectional propagation for the first time in experiments. Moreover, due to the new effect provided by the mode width degree of freedom, the propagation of these large-area quantum-spin-Hall waveguide states exhibits unusual strong robustness against defects, e.g., large voids with size reaching several unit cells, which has not been reported previously. Our work not only completes the last member of such states in the photonic quantum Hall, quantum valley-Hall and quantum spin-Hall family, but also provides further opportunities for high-capacity energy transport with tunable mode width and exceptional robustness in integrated photonic devices and on-chip communications.

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Liu He and Jianquan Yao "Observation of topological large-area pseudospin-momentum locking waveguide states", Proc. SPIE 13244, Nano-optoelectronics and Micro/Nano-photonics X, 132440D (20 November 2024); https://doi.org/10.1117/12.3035175

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available