Obstruction immune topological propagation in 3D-printed metal-based photonic crystals

Jana, Sambhu; Devi, Koijam Monika; Chowdhury, Dibakar Roy

doi:10.1016/j.optcom.2022.129111

Cited by 5 publications

(4 citation statements)

References 38 publications

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“…The NLOGB was later experimentally implemented by Wimmer et al [44] in a system involving the propagation of light pulses in optical fibers, an implementation in which the displacement operation consists in delaying or advancing the pulses, so that the QW occurs along the physical time dimension. More recently, the same group made a proposal of NLQW in optical mesh lattices [45], see also the related paper [46], a system that has been recently revisited by Jana et al [47]. The NLOGB model has also been the subject of several theoretical studies, including the study of its continuous limit as a nonlinear Dirac equation [48][49][50].…”

Section: Nonlinear Dqwmentioning

confidence: 99%

Bright and dark solitons in a photonic nonlinear quantum walk: lessons from the continuum

Anglés-Castillo,

Pérez,

Roldán

2024

New J. Phys.

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We propose a nonlinear quantum walk model inspired in a photonic implementation in which thepolarization state of the light field plays the role of the coin-qubit. In particular, we take profit of thenonlinear polarization rotation occurring in optical media with Kerr nonlinearity, which allows toimplement a nonlinear coin operator, one that depends on the state of the coin-qubit. We considerthe space-time continuum limit of the evolution equation, which takes the form of a nonlinear Diracequation. The analysis of this continuum limit allows us to gain some insight into the existenceof different solitonic structures, such as bright and dark solitons. We illustrate several propertiesof these solitons with numerical calculations, including the effect on them of an additional phasesimulating an external electric field.

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Section: Nonlinear Dqwmentioning

confidence: 99%

Bright and dark solitons in a photonic nonlinear quantum walk: lessons from the continuum

Anglés-Castillo,

Pérez,

Roldán

2024

New J. Phys.

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“…more [15][16][17]. Over the past few years, topological photonics has fueled significant research interest due to its intriguing characteristics, including unidirectional transmission [18], reflection-free energy transport [8], backscattering immune propagation [19], etc. The practical realization of these properties has led to the quest for a novel optical platform hosting intriguing light-matter interaction.…”

Section: Introductionmentioning

confidence: 99%

“…The robustness of these topological systems has been examined in the presence of various structural/lattice imperfections, including point defect [42], line defects [43], sharp bends [44][45][46], lattice defects [26], etc. However, these studies include either the introduction of defect states around the topological channel or the reconstruction of the topological channel in various forms (Z, Ω), which have little influence on the traveling edge states due to its valley-locked propagation [19,26,47]. Although the recent work on topological ring resonator deals with wave propagation by introducing defects on the topological channel, the robustness of the excited resonances to an external perturbation demands attentions [48].…”

Section: Introductionmentioning

confidence: 99%

External defect immune high quality resonances in microwave topological ring resonator

Jena,

Kulkarni,

Varshney

et al. 2024

J. Phys. D: Appl. Phys.

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Recently, topological ring resonators (TRRs) have emerged as a burgeoning platform for exploring the topological aspects of photonic systems and resonator dynamics. Integrating topology into cavity dynamics offers a new paradigm to unveil various fascinating phenomena, including backscattering immune wave propagation, unidirectional transmission, and reflection-free energy transport. With this background, we provide a scheme to achieve robust high Q resonances in a metal-based topological photonic crystal (TPC) exhibiting defect-immune spectral characteristics in the microwave frequency regime. Coupled with a ring resonator, our proposed topological platform demonstrates the excitation of high Q resonances in the range 230-540. Except for the resonances, a robust microwave transmission (~0 dB) is observed in the investigated frequency regime 7.1-7.6 GHz, depicting a minimal scattering loss even around the sharp corners of the ring resonator. Further, the topological robustness of the propagating microwave and the excited resonances are examined by introducing an external Si obstacle at the domain interface. Our study reveals a minimal transmission loss (<7 dB) and negligible perturbation (<8%) in the Q factors when the Si barrier placed towards the input end of the straight topological waveguide. In addition, we have also demonstrated a novel way of exciting new resonances in the ring resonator that holds considerable promise for designing a TRR-based all-pass notch filter in the microwave regime.

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“…Fortunately, the discovery of topological photonics has led to radical changes in the field of photonics that act as a major foundation for these investigations and continues to expand as a source of novel ideas for developing photonic devices including defect immune unidirectional propagation [6], beam splitters [7,8], filters [9,10], non-linear devices [11,12], and so on [13,14]. The topological PhCs (TPCs) enter the photonic world by analogy with the time reversal breaking features associated with the quantum Hall effect [15], and additionally, the discovery of the valley degrees of freedom renders it attractive for innumerable applications across all frequency regimes [16,17]. In general, the valley-dependent topological edge states are generated by breaking the mirror symmetry of the periodic structure formed by 2D-honey comb lattices which are confined at the boundaries between two bulk PhC with opposite valley-Chern indices [18,19].…”

Section: Introductionmentioning

confidence: 99%

Topological edge state assisted dynamically tunable microwave propagations in photonic crystals

Jana,

Devi,

Kulkarni

et al. 2023

New J. Phys.

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Topological photonics has emerged as a cutting-edge and intriguing field that permits electromagnetic waves to transmit with minimal losses even when they come in contact with sharp turns or imperfections or defects. In this study, we validate a strategy to realize dynamically amplitude tunable light propagation in a topological waveguide based on a three-dimensional printed valley Hall photonic crystal structure operating in the microwave frequency region. Here, tunable light propagation is facilitated by inserting an active defect in the form of a semiconductor (silicon) material slab across the domain boundary of the topological waveguide. In this configuration, dynamic variation of transmission amplitude is realized via photoexcitation of the semiconductor defect using an external laser of wavelength, λ ∼ 510 nm. This results in active amplitude tunability of ∼ − 10 dB in topological wave propagation under a photoexcitation of 100 mW. Our demonstrated route can lead to the design of dynamically controlled topological photonic devices such as optical modulators, switches, optical buffers, etc which are important for the development of 6G communication systems.

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Obstruction immune topological propagation in 3D-printed metal-based photonic crystals

Cited by 5 publications

References 38 publications

Bright and dark solitons in a photonic nonlinear quantum walk: lessons from the continuum

Bright and dark solitons in a photonic nonlinear quantum walk: lessons from the continuum

External defect immune high quality resonances in microwave topological ring resonator

Topological edge state assisted dynamically tunable microwave propagations in photonic crystals

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