Compact beam splitters in coupled waveguides using shortcuts to adiabaticity

Chen, Xi; Wen, Rui; Shi, Jinjing; Tseng, Shuo Yen

doi:10.1088/2040-8986/aab02c

Cited by 22 publications

(21 citation statements)

References 53 publications

(97 reference statements)

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“…6, where x c = 0 mm y c = 1.03 mm. Here the operation band ranges from 4 GHz to 7 GHz, when H 0 is tuned from 443 G to 1450 G. In the region [4,7] GHz, H 0 versus f for η 1 /η 2 = 0.65/0.35 is similar to the first case as expected. For both examples, the transmission efficiency of 100% is preserved.…”

Section: Characteristic Of the High-efficiency Splittersupporting

confidence: 76%

High-efficiency tunable T-shaped beam splitter based on one-way waveguide

Hong

Xiao²,

Deng

et al. 2018

J. Opt.

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Power splitters have been widely studied in the fields of radio frequency and integrated photonics, however, conventional splitters generally suffer from poor transmission and limited bandwidth. Here we propose a novel tunable T-shaped power splitter utilizing one-way waveguide that is composed by the yttrium–iron–garnet–air–metal configuration with one static magnetic field applied. We show that the transmission efficiency of such a splitter reaches 100% in the lossless case due to the suppression of reflection by the one-way waveguide. By introducing a defect in the junction area, the splitting ratio of the splitter can be gradually tuned by varying the external magnetic field, and large operation bandwidth can be achieved for a given splitting ratio. Our results presented here focus on the radio frequency, and the concept can easily be applied to the photonic area.

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Section: Characteristic Of the High-efficiency Splittersupporting

confidence: 76%

High-efficiency tunable T-shaped beam splitter based on one-way waveguide

Hong

Xiao²,

Deng

et al. 2018

J. Opt.

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“…Besides, Chung et al (2017) designed a short and broadband silicon asymmetric Yjunction two-mode (de)multiplexer using the theory in Martínez-Garaot et al (2017), Wu et al (2017c) put forward the generation of 3D entanglement using dressed states, and Huang et al (2017) applied the counterdiabatic approach to design shorter and robust two-and three-waveguide couplers. Finally, Chen et al (2018b) used the Lie-transform theory in Martínez-Garaot et al (2014a) to design compact beam splitters.…”

Section: Optical Devicesmentioning

confidence: 99%

Shortcuts to adiabaticity: Concepts, methods, and applications

et al. 2019

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Shortcuts to adiabaticity (STA) are fast routes to the final results of slow, adiabatic changes of the controlling parameters of a system. The shortcuts are designed by a set of analytical and numerical methods suitable for different systems and conditions. A motivation to apply STA methods to quantum systems is to manipulate them on timescales shorter than decoherence times. Thus shortcuts to adiabaticity have become instrumental in preparing and driving internal and motional states in atomic, molecular, and solid-state physics. Applications range from information transfer and processing based on gates or analog paradigms, to interferometry and metrology. The multiplicity of STA paths for the controlling parameters may be used to enhance robustness versus noise and perturbations, or to optimize relevant variables. Since adiabaticity is a widespread phenomenon, STA methods also extended beyond the quantum world, to optical devices, classical mechanical systems, and statistical physics. Shortcuts to adiabaticity combine well with other concepts and techniques, in particular with optimal control theory, and pose fundamental scientific and engineering questions such as finding speed limits, quantifying the third law, or determining process energy costs and efficiencies. We review concepts, methods and applications of shortcuts to adiabaticity and outline promising prospects, as well as open questions and challenges ahead.

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“…During the optical simulations, the refractive index of the substrate is chosen as n s = 1.5. In the nearly symmetric waveguide, the coupling coefficient C and the waveguide separation D are well fitted by the following exponential relation: [66]. We choose that all waveguides have the same width W = 3µm and ∆n = 0.0116.…”

Section: Examples Spectral Behaviormentioning

confidence: 99%

Controllable multiple beam splitting in Hermitian and non-Hermitian symmetric coupled waveguide systems

Dou,

Wei,

Han

et al. 2022

Preprint

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We investigate high-fidelity multiple beam splitting in Hermitian and non-Hermitian symmetric coupled waveguides with one input and 2N output waveguide channels. In Hermitian systems, we realize adiabatically light splitting in resonant case based on the stimulated Raman adiabatic passage (STIRAP) and arbitrary proportion from the middle waveguide to outer waveguides in propagation coefficients mismatch case using shortcuts to adiabaticity (STA) technique. In non-Hermitian systems with even waveguides being dissipative, the compact and robust beam splitting can be achieved by eliminating the non-adiabatic coupling via the non-Hermitian STA method. We further verify the feasibility of our theoretical predictions by means of the beam propagation method (BPM). The suggested multiple beam splitters open new opportunities for the realization of on-chip high-bandwidth photonics with high fidelity in short distances.

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Compact beam splitters in coupled waveguides using shortcuts to adiabaticity

Cited by 22 publications

References 53 publications

High-efficiency tunable T-shaped beam splitter based on one-way waveguide

High-efficiency tunable T-shaped beam splitter based on one-way waveguide

Shortcuts to adiabaticity: Concepts, methods, and applications

Controllable multiple beam splitting in Hermitian and non-Hermitian symmetric coupled waveguide systems

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