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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

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)

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)

Nanolasers

  • Thresholdless nanoscale lasers (Nature 2012)

  • Photonic machines and spin Hamiltonians (Nature Materials 2020)

  • Light sources for microscopy

Supersymmetry (SUSY) in optics and photonics

  • High power integrated supersymmetric laser arrays (Science 2019)

  • Supersymmetric networks