Cheng GUO

Physicist

Ph.D., Applied Physics, Stanford University

Photonics – Energy, Information, Material

guocheng at stanford.edu

Highlight

Reciprocity Constraints on Reflection

Loretnz reciprocity is known to impose constraints on transmission, absorption, and emission. We reveal reciprocity constraints on reflection.

Physical Review Letters

Adjoint Kirchhoff's Law of Thermal Radiation

We study the relation between angular spectral absorptivity and emissivity for any thermal emitter using Shubnikov groups.

Physical Review X

Internal Symmetries of Linear Photonic System

We provide a unified theory of reciprocity, energy conservation, and time-reversal symmetry from the perspective of internal symmetry.

Physical Review A

Guided Space-Time Wave Packets

We generate guided space-time wave packets in a multimode waveguide using multilevel interband photonic transitions.

Physical Review Research

Light Bullet Generation with Metasurface

We generate 3D linear light bullets propagating in free space using a single passive nonlocal optical surface.

Light: Science & Applications

Tunable Thermal Emission from Moiré Patterns

We propose a wavelength-tunable narrow-band thermal emitters over a wide wavelength range based on the Moiré effect.

Applied Physics Letters

A Radiative Thermal Router Based on Weyl Semimetals

We demonstrate a radiative thermal router based on magnetic Weyl semimetals.

ACS Photonics

Squeeze Free Space with Nonlocal Flat Optics

We design an optical device that can replace free space of much larger thickness.

Optica

Schubnikov Group for Radiative Heat Transfer

We study the constraints on reciprocal and non-reciprocal many-body radiative heat transfer imposed by symmetry and the second law of thermodynamics.

Physical Review B

Optical Isolators Based on Weyl Semimetals

We design a compact optical isolator using magnetic Weyl semimetals.

Advanced Optical Materials

Nonreciprocal Thermal Radiation with Weyl Semimetals

We design a nonreciprocal thermal emitter based on magnetic Weyl semimetals, which can strongly violate Kirchhoff's law without external magetic fields.

Nano Letters

Meron Spin Textures in Momentum Space

We show that a momentum-space meron spin texture for electromagnetic fields in free space can be generated by controlling the interaction of light with a photonic crystal slab having a nonzero Berry curvature.

Physical Review Letters