Journal ArticleDOI
Resonance mode expansions and exact solutions for nonuniform gratings
TLDR
Using resonance mode expansions, exact expressions are obtained for the fields, the grating profile, and the reflection and transmission spectra for a large class of nonuniform linear gratings that couple a pair of either copropagating or contrapropagating modes.Abstract:
Resonance modes play an important part in understanding linear nonuniform gratings, analogous to the role played by waveguide modes in waveguide theory. Using resonance mode expansions, exact expressions are obtained for the fields, the grating profile, and the reflection and transmission spectra for a large class of nonuniform linear gratings. The method can deal with linear gratings that couple a pair of either copropagating or contrapropagating modes. The formalism covers the effects of gain and loss (in the small signal limit), chirp, taper, and birefringence. The exact solutions can be used to investigate designs for grating structures. Two detailed example applications of the technique are presented here: an exact solution for a grating that supports only a single resonance mode, and an exact solution for a grating that has nonreciprocal reflective properties from its two ends. \textcopyright{} 1996 The American Physical Society.read more
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Journal ArticleDOI
Nonlinear waves in PT -symmetric systems
TL;DR: The concept of parity-time symmetric systems is rooted in non-Hermitian quantum mechanics where complex potentials obeying this symmetry could exhibit real spectra as discussed by the authors, which has applications in many fields of physics, e.g., in optics, metamaterials, acoustics, Bose-Einstein condensation, electronic circuitry, etc.
Journal ArticleDOI
Non-Hermitian Physics
TL;DR: In this article, a review of non-Hermitian classical and quantum physics can be found, with an overview of how diverse classical systems, ranging from photonics, mechanics, electrical circuits, acoustics to active matter, can be used to simulate non-hermitian wave physics.
Journal ArticleDOI
Coherent perfect absorbers: linear control of light with light
Denis G. Baranov,Denis G. Baranov,Denis G. Baranov,Alex Krasnok,Timur Shegai,Andrea Alù,Yidong Chong +6 more
TL;DR: A coherent perfect absorber is a system in which complete absorption of electromagnetic radiation is achieved by controlling the interference of multiple incident waves as discussed by the authors, which can be made much more efficient by exploiting wave interference.
Journal ArticleDOI
Nonreciprocal waveguide Bragg gratings.
TL;DR: A systematic analytical and numerical analysis of a new class of Bragg gratings which exhibits a strong amplification at the resonance wavelength (even with zero net-gain level in the waveguide) while simultaneously providing higher wavelength selectivity than the equivalent index Bragg grating.
Journal ArticleDOI
Coherent perfect absorbers: linear control of light with light
Denis G. Baranov,Denis G. Baranov,Denis G. Baranov,Alex Krasnok,Timur Shegai,Andrea Alù,Yidong Chong +6 more
TL;DR: A coherent perfect absorber is a system in which the complete absorption of electromagnetic radiation is achieved by controlling the interference of multiple incident waves as mentioned in this paper, which is a phenomenon that underlies many applications including molecular sensing, photocurrent generation and photodetection.