Dynamically encircling exceptional points in active media (Conference Presentation)

Jason Leshin; Absar U. Hassan; Demetrios N. Christodoulides; Mercdeh Khajavikhan

doi:10.1117/12.2508530

4 March 2019 Dynamically encircling exceptional points in active media (Conference Presentation)

Jason Leshin, Absar U. Hassan, Demetrios N. Christodoulides, Mercdeh Khajavikhan

Proceedings Volume 10921, Integrated Optics: Devices, Materials, and Technologies XXIII; 109210K (2019) https://doi.org/10.1117/12.2508530
Event: SPIE OPTO, 2019, San Francisco, California, United States

Abstract

Dynamically encircling an exceptional point (EP) of a non-Hermitian system, in which the parameters are continuously varied around the EP, offers direction dependent conversion into orthogonal eigenstates that is robust to input state variation. The requirement for adiabatic conditions in the encircling, equating to very slow modulation in parameter space about the EP, ultimately results in long path lengths. This proves a strong limitation on the use of passive materials for mode conversion in such systems, as including loss becomes necessary. Thus, in passive converters, output of the converted mode will have very small intensity and be difficult to integrate into larger systems. Here we experimentally demonstrate chiral conversion into orthogonal supermodes by dynamic encirclement of an EP in an active, nonlinear system of two coupled waveguides. The introduction of gain allows for sufficiently adiabatic systems with control of output intensity, equaling or amplifying that of the input signal. This work paves the way for further use of active media in chiral mode converters, as well as the fabrication of semiconductor lasers with direction dependent mode output, more suitable for integration into larger systems.

Conference Presentation

Citation Download Citation

Jason Leshin, Absar U. Hassan, Demetrios N. Christodoulides, and Mercdeh Khajavikhan "Dynamically encircling exceptional points in active media (Conference Presentation)", Proc. SPIE 10921, Integrated Optics: Devices, Materials, and Technologies XXIII, 109210K (4 March 2019); https://doi.org/10.1117/12.2508530

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