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Title: PT-symmetric phase in kagome-based photonic lattices

The kagome lattice is a two-dimensional network of corner-sharing triangles and is often associated with geometrical frustration. In particular, the frustrated coupling between waveguide modes in a kagome array leads to a dispersionless flat band consisting of spatially localized modes. Here in this study, we propose a complex photonic lattice by placing PT-symmetric dimers at the kagome lattice points. Each dimer corresponds to a pair of strongly coupled waveguides. With balanced arrangement of gain and loss on individual dimers, the system exhibits a PT-symmetric phase for finite gain/loss parameter up to a critical value. The beam evolution in this complex kagome waveguide array exhibits a novel oscillatory rotation of optical power along the propagation distance. Finally, long-lived local chiral structures originating from the nearly flat bands of the kagome structure are observed when the lattice is subject to a narrow beam excitation.
Authors:
 [1] ;  [2]
  1. Univ. of Virginia, Charlottesville, VA (United States); Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Report Number(s):
LA-UR-15-26664
Journal ID: ISSN 0146-9592; OPLEDP
Grant/Contract Number:
AC52-06NA25396
Type:
Accepted Manuscript
Journal Name:
Optics Letters
Additional Journal Information:
Journal Volume: 40; Journal Issue: 24; Journal ID: ISSN 0146-9592
Publisher:
Optical Society of America (OSA)
Research Org:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; 36 MATERIALS SCIENCE; Waveguides; Systems with special symmetry; Metamaterials; Classical and quantum physics
OSTI Identifier:
1457259
Alternate Identifier(s):
OSTI ID: 1228720

Chern, Gia-Wei, and Saxena, Avadh. PT-symmetric phase in kagome-based photonic lattices. United States: N. p., Web. doi:10.1364/OL.40.005806.
Chern, Gia-Wei, & Saxena, Avadh. PT-symmetric phase in kagome-based photonic lattices. United States. doi:10.1364/OL.40.005806.
Chern, Gia-Wei, and Saxena, Avadh. 2015. "PT-symmetric phase in kagome-based photonic lattices". United States. doi:10.1364/OL.40.005806. https://www.osti.gov/servlets/purl/1457259.
@article{osti_1457259,
title = {PT-symmetric phase in kagome-based photonic lattices},
author = {Chern, Gia-Wei and Saxena, Avadh},
abstractNote = {The kagome lattice is a two-dimensional network of corner-sharing triangles and is often associated with geometrical frustration. In particular, the frustrated coupling between waveguide modes in a kagome array leads to a dispersionless flat band consisting of spatially localized modes. Here in this study, we propose a complex photonic lattice by placing PT-symmetric dimers at the kagome lattice points. Each dimer corresponds to a pair of strongly coupled waveguides. With balanced arrangement of gain and loss on individual dimers, the system exhibits a PT-symmetric phase for finite gain/loss parameter up to a critical value. The beam evolution in this complex kagome waveguide array exhibits a novel oscillatory rotation of optical power along the propagation distance. Finally, long-lived local chiral structures originating from the nearly flat bands of the kagome structure are observed when the lattice is subject to a narrow beam excitation.},
doi = {10.1364/OL.40.005806},
journal = {Optics Letters},
number = 24,
volume = 40,
place = {United States},
year = {2015},
month = {12}
}