Extraordinary transmission and reflection in PT-symmetric two-segment-connected triangular optical waveguide networks with perfect and broken integer waveguide length ratios

doi:10.1088/1674-1056/ab3f92

Abstract By adjusting the waveguide length ratio, we study the extraordinary characteristics of electromagnetic waves propagating in one-dimensional (1D) parity-time-symmetric (PT-symmetric) two-segment-connected triangular optical waveguide networks with perfect and broken integer waveguide length ratios respectively. It is found that the number and the corresponding frequencies of the extremum spontaneous PT-symmetric breaking points are dependent on the waveguide length ratio. Near the extremum breaking points, ultrastrong extraordinary transmissions are created and the maximal can arrive at, respectively, 2.4079×10¹⁴ and 4.3555×10¹³ in both kinds of networks. However, bidirectional invisibility can only be produced by the networks with broken integer waveguide length ratio, whose mechanism is explained in detail from the perspective of photonic band structure. The findings of this work can be useful optical characteristic control in the fabrication of PT-symmetric optical waveguide networks, which possesses great potential in designing optical amplifiers, optical energy saver devices, and special optical filters.

Keywords: parity-time symmetry optical waveguide network integer broken ratios

Received: 10 June 2019
Revised: 17 July 2019
Accepted manuscript online:

PACS:	42.15.Eq	(Optical system design)
	42.25.Bs	(Wave propagation, transmission and absorption)
	42.82.Et	(Waveguides, couplers, and arrays)

Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 11674107, 61475049, 11775083, 61875057, 61774062, and 61771205) and Special Funds for the Cultivation of Guangdong College Students' Scientific and Techonlogical Innovation, China (Grant No. pdjhb0139).

Corresponding Authors: Xiang-Bo Yang
E-mail: xbyang@scnu.edu.cn

Cite this article:

Jia-Ye Wu(吴嘉野), Xu-Hang Wu(吴栩航), Xiang-Bo Yang(杨湘波), Hai-Ying Li(李海盈) Extraordinary transmission and reflection in PT-symmetric two-segment-connected triangular optical waveguide networks with perfect and broken integer waveguide length ratios 2019 Chin. Phys. B 28 104208

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Extraordinary transmission and reflection in PT-symmetric two-segment-connected triangular optical waveguide networks with perfect and broken integer waveguide length ratios

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