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LASSP & AEP Seminar - Bo Zhen - University of Pennsylvania

Tuesday, April 26, 2022 at 12:20pm

Virtual Event

Hosted by: Jie Shan

Title: Nonlinear topological photonics

Abstract: Topological photonics is a rapid developing field, drawing inspirations from the recent successes in electronic systems. Yet, there are two major differences between photons and electrons: (1) photons obey Maxwell’s equations, which permit nonlinearities, whereas the Schrodinger equation is always linear; (2) photons are bosons, which allows one to probe responses at virtually any desired energy (frequency) without the limitation of the Fermi energy as in electrons. Based on these differences, I will present our recent theoretical and experimental results in exploring the role of optical nonlinearity in topological physics. On the theory side, these include defining topological invariants in driven nonlinear photonic crystals [1] and identifying various topological phases, such as the Floquet Chern insulators [1], dipole phases [2], and quadrupole phases [3,4]. On the experiment side, I will present our recent results towards observing Floquet Chern insulators, protecting out-of-plane photon radiation losses using topology [5] and their applications as grating couplers [6]. Finally, I will present an outlook for potential opportunities in science and technology such as night-vision goggles.  

 

References:

[1] Nature Communications 10, 4194 (2019)

[2] Physical Review Letters 126, 113901 (2021)   

[3] Nature Communications 11, 3119 (2020)  

[4] arXiv:2103.01198

[5] Nature 574, 501 (2019)

[6] Nature 580, 467 (2020)

 

Dial-In Information

Lea Reagan is inviting you to a scheduled Zoom meeting.

Topic: LASSP & AEP Seminar - Bo Zhen - University of Pennsylvania
Time: Apr 26, 2022 12:20 PM Eastern Time (US and Canada)

Join Zoom Meeting
https://cornell.zoom.us/j/98259737084?pwd=OFg1SHg2SDRDUStzOURvYkY3S1NIQT09

Meeting ID: 982 5973 7084
Passcode: 303484

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Event Type

Seminar

Departments

LASSP, Applied and Engineering Physics

Tags

lassp_and_aep_seminar, lassp

Contact E-Mail

lmr268@cornell.edu

Contact Name

Lea Reagan

Contact Phone

6072559684

Speaker

Bo Zhen

Speaker Affiliation

University of Pennsylvania

Dept. Web Site

https://live-sas-physics.pantheon.sas.upenn.edu/people/standing-faculty/bo-zhen

Open To

Public

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