Simulation of electromagnetically induced transparency like acoustic transmission assisted by PT-symmetry

Department of Physics, Key Laboratory of Advanced Micro-structure Materials (MOE), Tongji University, Shanghai 200092, P.R. China

^a e-mail: hqlee@tongji.edu.cn

Received: 9 July 2012
Revised: 3 September 2012
Accepted: 21 January 2013
Published online: 20 March 2013

Abstract

Since the pioneer work by Bender and Boettcher on non-Hermitian Hamiltonian under paritytime (PT) symmetry [Phys. Rev. Lett. 80, 5243 (1998)], PT-symmetry optical coupled systems have been investigated extensively. Here we propose theoretically perfect transparency of a PT-symmetric acoustic coupled system which is comprised of a waveguide channel and two same-sized side-coupled resonators. Specifically, we demonstrate that with the change in the amplitude of attenuation and amplification coefficient, the spatial symmetry of two resonators is spontaneously broken which triggers an acoustic analog of electromagnetically induced transparency (EIT) by assigning anti-phase to the pressure field inside the two resonators.