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Title: Theoretical and experimental investigations of asymmetric light transport in graded index photonic crystal waveguides

To provide asymmetric propagation of light, we propose a graded index photonic crystal (GRIN PC) based waveguide configuration that is formed by introducing line and point defects as well as intentional perturbations inside the structure. The designed system utilizes isotropic materials and is purely reciprocal, linear, and time-independent, since neither magneto-optical materials are used nor time-reversal symmetry is broken. The numerical results show that the proposed scheme based on the spatial-inversion symmetry breaking has different forward (with a peak value of 49.8%) and backward transmissions (4.11% at most) as well as relatively small round-trip transmission (at most 7.11%) in a large operational bandwidth of 52.6 nm. The signal contrast ratio of the designed configuration is above 0.80 in the telecom wavelengths of 1523.5–1576.1 nm. An experimental measurement is also conducted in the microwave regime: A strong asymmetric propagation characteristic is observed within the frequency interval of 12.8 GHz–13.3 GHz. The numerical and experimental results confirm the asymmetric transmission behavior of the proposed GRIN PC waveguide.
Authors:
; ; ;  [1] ;  [2] ;  [3]
  1. Nanophotonics Research Laboratory, Department of Electrical and Electronics Engineering, TOBB University of Economics and Technology, Ankara 06560 (Turkey)
  2. Electrical and Electronics Engineering Department, Ankara University, Gölbasi, Ankara 06830 (Turkey)
  3. Department of Electrical and Electronics Engineering, Bilkent University, Bilkent, Ankara 06800 (Turkey)
Publication Date:
OSTI Identifier:
22280600
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 104; Journal Issue: 3; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ASYMMETRY; CRYSTALS; DISTURBANCES; GHZ RANGE; MICROWAVE RADIATION; POINT DEFECTS; SYMMETRY BREAKING; VISIBLE RADIATION; WAVEGUIDES