Coherent perfect absorption and reflection in slow-light waveguides

Abstract

We identify a family of unusual slow-light modes occurring in lossy multi-mode grating waveguides, for which either the forward or backward mode components, or both, become degenerate. In the fully-degenerate case, by varying the wave amplitudes in a uniform input waveguide, one can modulate between coherent perfect absorption (zero reflection) and perfect reflection. The perfectly-absorbed wave has anomalously short absorption length, scaling as the inverse 1/3 power of the absorptivity.

References in corpus (2)

• Coherent Perfect Absorbers: Time-reversed Lasers
• Slow light with flat or offset band edges in multi-mode fiber with two gratings

Cited by in corpus (3)

• Coherent perfect absorbers: linear control of light with light
• Coalescence of spectral singularities and phase diagrams for one-dimensional PT symmetric photonic crystals
• Coherent optical control of polarization with a critical metasurface