Cornell University

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LASSP & AEP Seminar by Mercedeh Khajavikhan (University of Southern California)

Tuesday, October 4, 2022 at 12:20pm

Physical Sciences Building, 401
245 East Avenue

Mercedeh Khajavikhan
University of Southern California

Non-Hermitian and Topological Photonics: Optics at an Exceptional Point

In recent years, non-Hermitian degeneracies, also known as exceptional points (EPs), have emerged as a new paradigm for engineering the response of optical systems. At such points, an N-dimensional system can be represented by a single eigenmode. As a result, these points are associated with abrupt phase transitions in parameter space. Among many different non-conservative photonic configurations, parity-time (PT) symmetric systems are of particular interest since they provide a powerful platform for systematically exploring the physics and consequently utilizing the exceptional points. In this talk, I will review some of our recent works in the area of non-Hermitian active photonics. For example, in a series of papers, we have demonstrated how the generation and judicial incorporation of these points in laser systems can result in unexpected dynamics, unusual linewidth behavior, and improved modal response. On the other hand, biasing a photonic system at an exceptional point can lead to orders of magnitude enhancement in sensitivity- an effect that can enable a new generation of ultrasensitive optical sensors on-chip. Non-Hermiticity can also be used as a means to promote an edge mode in photonic topological insulator lattices. Our most recent result on using non-Hermiticity to engineer interaction dynamics in optical lattices will be presented along with its applications in designing a new class of fully reconfigurable lasers as well as implementing novel topological models.

Hosted by Jeffrey Moses

NEW this semester: FREE PIZZA served starting at 12:10 p.m.!
Please bring your own beverage

For those who cannot attend in person but would like to see the seminar, livestream only will be available via Zoom:
https://cornell.zoom.us/j/98722799978?pwd=OEdYdGpWYjVuSHh2Ry82NGw3T3ZZQT09
Webinar ID: 987 2279 9978
Passcode: 8235

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Event Type

Seminar

Departments

LASSP, Applied and Engineering Physics, Engineering

University Themes

Research

Tags

lassp_and_aep_seminar, lassp, engineering, applied and engineering physics

Website

https://www.lassp.cornell.edu/events

Cost

Free

Contact E-Mail

lbl3@cornell.edu

Contact Name

Lynn Lauper

Contact Phone

607-255-3591

Dept. Web Site

https://www.lassp.cornell.edu/

Disability Access Information

If you need accommodations to participate in this event, please contact us as soon as possible

Open To

Open to the public

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