Research

The current projects in the group are as follows:

• Design and demonstration of novel light sources for stimulated emission depletion (StED) microscopy

• Study coherent and collective behaviors in laser networks

• Topological phenomena in active photonic platforms

• Study light interactions with Weyl semimetals

• Sensing beyond Hermitian limit, Exceptional point based sensors, chip based gyroscopes

• Novel photonic structures using non-Hermitian exceptional points

• Supersymmetry in optics and photonics

• Terahertz generation using semiconductor lasers

• Study cavity quantum electrodynamics and nonlinear processes at exceptional points

• Programmable universal multifunctional apertures

• Classical entanglement in structured optical fields

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Parity Time Symmetry, non-Hermiticity and Exceptional points

• PT-symmetric microring lasers (shown the first PT-symmetric laser, Science 2014)

• Ultra-sensitive sensors based on higher-order exceptional points (Nature 2017)

• Dark-state lasers: mode management using exceptional points (OL 2017)

• Non-Hermitian ring laser gyroscopes with enhanced Sagnac sensitivity (Nature 2019)

• On-chip ring laser gyroscopes operating at exceptional points

• Orbital angular momentum generation using chiral exceptional points (ACS Photonics 2019)

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Topological Photonics

• Topological insulator lasers (Science 2018 and Science 2018)

• Unidirectional light propagation in laser systems

• Photonic topological Haldane model

• Topological features of exceptional points (PRL 2017)

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Nanolasers

• Thresholdless nanoscale lasers (Nature 2012)

• Photonic machines and spin Hamiltonians (Nature Materials 2020)

• Light sources for microscopy

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Supersymmetry (SUSY) in optics and photonics

• High power integrated supersymmetric laser arrays (Science 2019)

• Supersymmetric networks