Multiple CPA−laser points and anisotropic reflection resonances in PT−symmetric Rudin-Shapiro photonic multilayers

Wu, Min; Dong, Zhen; Zhao, Dong; Liu, Fangmei; Fang, Ming; Shen, Jing

doi:10.1016/j.mtcomm.2022.104129

Cited by 3 publications

(1 citation statement)

References 26 publications

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“…The absorption and radiation of light waves by materials make the loss of the system inevitable through the interaction process of light and material [1]. By using the stimulated radiation of the gain medium or the parametric process of the nonlinear medium [2][3][4], the energy loss or gain of the system can be compensated. The introduction of loss and gain in non-Hermitian optical structures provides more freedom for photon manipulation.…”

Section: Introductionmentioning

confidence: 99%

Multi-Wavelength Coherent-Perfect-Absorption−Laser Points and Half-Wave Phase Shift in Parity-Time-Reciprocal Scaling Symmetry Structure

Xiao,

Hu,

Chen

et al. 2023

Crystals

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Two slabs of dielectrics with different values of refractive index are synthesized to form a composite structure and the whole system satisfies parity-time-reciprocal scaling symmetry. Four coherent-perfect-absorber-laser points are induced by modulating the incident wavelength of lightwaves and the loss/gain factor of materials. The locations of coherent-perfect-absorber-laser points in parameter space, which manifests the multi-wavelengths of coherent-perfect-absorber-lasers could be regulated by the incidence angle. Especially, a value of π phase shift in the transmitted/reflected light wave has been observed as well. This research has potential applications in multi-wavelength absorbers/lasers and half-wave phase shifters.

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Section: Introductionmentioning

confidence: 99%

Multi-Wavelength Coherent-Perfect-Absorption−Laser Points and Half-Wave Phase Shift in Parity-Time-Reciprocal Scaling Symmetry Structure

Xiao,

Hu,

Chen

et al. 2023

Crystals

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Optical fractal resonances in Cantor-like photonic crystals

chen¹,

Ni²,

Zhao³

et al. 2022

Appl. Opt.

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We theoretically investigate the optical fractal effect in one-dimensional quasiperiodic photonic crystals (PCs). Dielectric multilayers arrayed alternately submit to the Cantor-like sequence rule. The optical fractal phenomenon is induced by modulating the generation number of the dielectric sequence. The optical fractal effect corresponds to a series of resonant modes, and the Cantor-like PCs approve more resonance modes than those in the Cantor PCs with the same order number. The transmission channels of resonances exponentially increase with the increase in the sequence generation number. Furthermore, the central waves of the transmission channels can be regulated by the incident angle flexibly. We expect this paper may pave a new way for the development of wavelength division multiplexers.

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Non-reciprocal spatial and quasi-reciprocal angular Goos-Hänchen shifts around double CPA-LPs in PT-symmetric Thue-Morse photonic crystals

Zhou

Chen³

et al. 2023

Opt. Express

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We theoretically investigate the Goos-Hänchen (GH) shifts of reflected light beams in Thue-Morse photonic crystals. The systems are constituted by two Thue-Morse dielectrics multilayers and satisfy parity-time (PT) symmetry. Double coherent perfect absorption laser points (CPA-LPs) are achieved in the parameter space composed of the incident angle and the gain-loss factor. Dramatic changes in the phase of reflection coefficient induce giant positive and negative spatial GH shifts at the CPA-LPs, while great angular GH shifts exist around the exceptional points (EPs). The spatial GH shifts present non-reciprocity for the forward and backward incident light waves near the double CPA-LPs, while the angular GH shifts are quasi-reciprocal. Increasing the Thue-Morse sequence number, these characteristics are approved around multiple CPA-LPs as well. Our work could pave the way to explore high-accuracy optical sensors.

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Multiple CPA−laser points and anisotropic reflection resonances in PT−symmetric Rudin-Shapiro photonic multilayers

Cited by 3 publications

References 26 publications

Multi-Wavelength Coherent-Perfect-Absorption−Laser Points and Half-Wave Phase Shift in Parity-Time-Reciprocal Scaling Symmetry Structure

Multi-Wavelength Coherent-Perfect-Absorption−Laser Points and Half-Wave Phase Shift in Parity-Time-Reciprocal Scaling Symmetry Structure

Optical fractal resonances in Cantor-like photonic crystals

Non-reciprocal spatial and quasi-reciprocal angular Goos-Hänchen shifts around double CPA-LPs in PT-symmetric Thue-Morse photonic crystals

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