Ultrastrong extraordinary transmission and reflection in PT-symmetric Thue-Morse optical waveguide networks

Abstract

In this paper, we construct a 1D PT-symmetric Thue-Morse aperiodic optical waveguide network (PTSTMAOWN) and mainly investigate the ultrastrong extraordinary transmission and reflection. We propose an approach to study the photonic modes and solve the problem of calculating photonic modes distributions in aperiodic networks due to the lack of dispersion functions and find that in a PTSTMAOWN there exist more photonic modes and more spontaneous PT-symmetric breaking points, which are quite different from other reported PT-symmetric optical systems. Additionally, we develop a method to sort spontaneous PT-symmetric breaking point zones to seek the strongest extraordinary point and obtain that at this point the strongest extraordinary transmission and reflection arrive at 2.96316 × 10 and 1.32761 × 10, respectively, due to the PT-symmetric coupling resonance and the special symmetry pattern of TM networks. These enormous gains are several orders of magnitude larger than the previous results. This optical system may possess potential in designing optical amplifier, optical logic elements in photon computers and ultrasensitive optical switches with ultrahigh monochromatity.

Theoretical Design of a Pump‐Free Ultrahigh Efficiency All‐Optical Switching Based on a Defect Ring Optical Waveguide Network

“…Three unit cells exist in the proposed DROWN. Previous studies on OWNs proved that the more unit cells an OWN possesses, the deeper the transmission valley will be . It seems that the number of unit cells can be increased to greatly improve the switching efficiency/transmission ratio.…”

“…It seems that the number of unit cells can be increased to greatly improve the switching efficiency/transmission ratio. However, more unit cells introduce more propagation loss, which greatly affects the threshold control energy. Additionally, the increased length/size is not good for ultracompact integration.…”

“…Optical waveguide networks (OWNs), composed of 1D waveguide segments, are a type of artificial PBG structures, which have been studied intensively in the last two decades . Compared to PCs and other types of PBG materials/structures used in all‐optical switching, OWNs are capable of producing ultrastrong photonic localizations by introducing defects into the system .…”

Quasi‐Blackbody, Bidirectional Super Reflection, and New Total Reflection Produced by Periodic Optical Waveguide Networks Based on Three‐Order PT‐Symmetric Substructures

“…Subsequently, the special optical characteristics of PT-symmetric optical systems, such as unidirectional invisibility, [10][11][12][13][14][15][16]20,22] ultrastrong transmission and reflection, [11,15,19] and coherent perfect absorption, [8,16,21] have attracted widespread attention. In, 2017, our research group [18] DOI: 10.1002/andp.202200207 combined the concept of PT-symmetry with optical waveguide networks to construct PT-symmetric optical waveguide networks. Then, the singular optical properties of EM waves when propagating in these networks were studied, such as photon modes, ultrastrong extraordinary transmission and reflection, and photonic band gap.…”

Extraordinary propagation characteristics of electromagnetic waves in one-dimensional anti-PT-symmetric ring optical waveguide network*

“…This artificial optical system has also aroused great interest [15][16][17][18][19][20] due to several extraordinary phenomena such as flat broadband light transport, [16] chiral mode conversion, [17] and ultra-strong transmission and reflection, [18] non-Hermitian particle-hole symmetry, [15,19] coherent switch. [20] In 1998, optical waveguide networks [21][22][23][24][25][26][27][28][29][30][31][32][33][34] were proposed as a new kind of photonic bandgap (PBG) structure. Compared with photonic crystals, it exhibits excellent characteristics such as higher flexibility in structural symmetry, [21,23,24] and great convenience in measuring the phase and amplitude of EM waves.…”