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Title: PT-symmetric laser absorber

Abstract

In a recent work, Y. D. Chong et al. [Phys. Rev. Lett. 105, 053901 (2010)] proposed the idea of a coherent perfect absorber (CPA) as the time-reversed counterpart of a laser, in which a purely incoming radiation pattern is completely absorbed by a lossy medium. The optical medium that realizes CPA is obtained by reversing the gain with absorption, and thus it generally differs from the lasing medium. Here it is shown that a laser with an optical medium that satisfies the parity-time (PT) symmetry condition {epsilon}(-r)={epsilon}*(r) for the dielectric constant behaves simultaneously as a laser oscillator (i.e., it can emit outgoing coherent waves) and as a CPA (i.e., it can fully absorb incoming coherent waves with appropriate amplitudes and phases). Such a device can thus be referred to as a PT-symmetric CPA laser. The general amplification or absorption features of the PT CPA laser below lasing threshold driven by two fields are determined.

Authors:
 [1]
  1. Dipartimento di Fisica, Politecnico di Milano, Piazza L. da Vinci 32, I-20133 Milano (Italy)
Publication Date:
OSTI Identifier:
21448618
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. A; Journal Volume: 82; Journal Issue: 3; Other Information: DOI: 10.1103/PhysRevA.82.031801; (c) 2010 The American Physical Society
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS; ABSORPTION; AMPLITUDES; C INVARIANCE; COHERENT RADIATION; GAIN; LASER RADIATION; LASERS; OSCILLATORS; P INVARIANCE; PERMITTIVITY; T INVARIANCE; AMPLIFICATION; DIELECTRIC PROPERTIES; ELECTRICAL PROPERTIES; ELECTROMAGNETIC RADIATION; ELECTRONIC EQUIPMENT; EQUIPMENT; INVARIANCE PRINCIPLES; PHYSICAL PROPERTIES; RADIATIONS; SORPTION

Citation Formats

Longhi, Stefano. PT-symmetric laser absorber. United States: N. p., 2010. Web. doi:10.1103/PHYSREVA.82.031801.
Longhi, Stefano. PT-symmetric laser absorber. United States. doi:10.1103/PHYSREVA.82.031801.
Longhi, Stefano. Wed . "PT-symmetric laser absorber". United States. doi:10.1103/PHYSREVA.82.031801.
@article{osti_21448618,
title = {PT-symmetric laser absorber},
author = {Longhi, Stefano},
abstractNote = {In a recent work, Y. D. Chong et al. [Phys. Rev. Lett. 105, 053901 (2010)] proposed the idea of a coherent perfect absorber (CPA) as the time-reversed counterpart of a laser, in which a purely incoming radiation pattern is completely absorbed by a lossy medium. The optical medium that realizes CPA is obtained by reversing the gain with absorption, and thus it generally differs from the lasing medium. Here it is shown that a laser with an optical medium that satisfies the parity-time (PT) symmetry condition {epsilon}(-r)={epsilon}*(r) for the dielectric constant behaves simultaneously as a laser oscillator (i.e., it can emit outgoing coherent waves) and as a CPA (i.e., it can fully absorb incoming coherent waves with appropriate amplitudes and phases). Such a device can thus be referred to as a PT-symmetric CPA laser. The general amplification or absorption features of the PT CPA laser below lasing threshold driven by two fields are determined.},
doi = {10.1103/PHYSREVA.82.031801},
journal = {Physical Review. A},
number = 3,
volume = 82,
place = {United States},
year = {Wed Sep 15 00:00:00 EDT 2010},
month = {Wed Sep 15 00:00:00 EDT 2010}
}