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Title: Broadband mixing of $${\mathscr{P}}{\mathscr{T}}$$-symmetric and $${\mathscr{P}}{\mathscr{T}}$$-broken phases in photonic heterostructures with a one-dimensional loss/gain bilayer

Combining loss and gain components in one photonic heterostructure opens a new route to efficient manipulation by radiation, transmission, absorption, and scattering of electromagnetic waves. Therefore, loss/gain structures enabling $${\mathscr{P}}{\mathscr{T}}$$-symmetric and $${\mathscr{P}}{\mathscr{T}}$$-broken phases for eigenvalues have extensively been studied in the last decade. In particular, translation from one phase to another, which occurs at the critical point in the two-channel structures with one-dimensional loss/gain components, is often associated with one-way transmission. In this report, broadband mixing of the $${\mathscr{P}}{\mathscr{T}}$$-symmetric and $${\mathscr{P}}{\mathscr{T}}$$-broken phases for eigenvalues is theoretically demonstrated in heterostructures with four channels obtained by combining a one-dimensional loss/gain bilayer and one or two thin polarization-converting components (PCCs). The broadband phase mixing in the four-channel case is expected to yield advanced transmission and absorption regimes. Various configurations are analyzed, which are distinguished in symmetry properties and polarization conversion regime of PCCs. The conditions necessary for phase mixing are then discussed. The simplest two-component configurations with broadband mixing are found, as well as the more complex three-component configurations wherein symmetric and broken sets are not yet mixed and appear in the neighbouring frequency ranges. Peculiarities of eigenvalue behaviour are considered for different permittivity ranges of loss/gain medium, i.e., from epsilon-near-zero to high-epsilon regime.
 [1] ;  [2] ;  [3] ;  [4]
  1. Bilkent Univ., Ankara (Turkey). Nanotechnology Research Center (NANOTAM)
  2. Adam Mickiewicz Univ., Poznan (Poland). Faculty of Physics
  3. Bilkent Univ., Ankara (Turkey). Nanotechnology Research Center (NANOTAM) and Dept. of Physics, Dept. of Electrical and Electronics Engineering and UNAM-Inst. of Materials Science and Nanotechnology
  4. Ames Lab. and Iowa State Univ., Ames, IA (United States); Foundation for Research & Technology-Hellas, Crete (Greece). Inst. of Electronic Structure and Laser (IESL)
Publication Date:
Report Number(s):
Journal ID: ISSN 2045-2322; PII: 14982
Grant/Contract Number:
AC02-07CH11358; 320081
Accepted Manuscript
Journal Name:
Scientific Reports
Additional Journal Information:
Journal Volume: 7; Journal Issue: 1; Journal ID: ISSN 2045-2322
Nature Publishing Group
Research Org:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division; Turkish Academy of Sciences (TÜBA); National Science Centre of Poland (NCN); European Union (EU)
Country of Publication:
United States
36 MATERIALS SCIENCE; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; Optical materials and structures; Quantum physics
OSTI Identifier: