Numerical Investigation of Reconfigurable Photonic Crystal Switch Based on Phase Change Nanomaterial

Rajasekar, R.; Raja, G. Thavasi; Robinson, S.

doi:10.1109/tnano.2020.3001832

Cited by 18 publications

(5 citation statements)

References 30 publications

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“…Photonic crystals are composed of fixed periodic sub-wavelength structures, which determine their band structure. Once the photonic crystal is produced, the band structure can be tuned by controlling the refractive index of the elements or their surroundings [7][8][9][10][11][12] by changing the optical properties of the material with nonlinear material's response, 13 using phase changing materials, 14,15 applying mechanical stress 16,17 or changing temperature. 18 However, less research has been done on changing the sub-wavelength structures and the dielectric configuration within the unit cell.…”

Section: Introductionmentioning

confidence: 99%

Pixelated photonic crystals for THz applications

Mur,

Ravnik

2024

Emerging Liquid Crystal Technologies XIX

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Photonic crystals manipulate light in unique and beneficial ways, acting as waveguides, laser cavities, and facilitating topological light propagation. However, the reconfiguration of photonic crystals has been limited, hindering their versatility. We have recently introduced the concept of pixelated 2D photonic crystals, where a pixelated matrix of the material enables variability in the dielectric profile. By changing the orientation state of liquid crystal molecules within individual pixels an effective refractive index for a specific input polarisation is altered. In this work we numerically show how different distributions of "on" and "off" state pixels and therefore different effective refractive index configurations in the periodically repeated unit cell effect the band structure of the material and its optical properties. Considering the size of pixels and unit cells, such photonic crystals would enable dynamic control of THz waves.

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Section: Introductionmentioning

confidence: 99%

Pixelated photonic crystals for THz applications

Mur,

Ravnik

2024

Emerging Liquid Crystal Technologies XIX

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“…Thus, coupling a probe signal in the waveguide, affects the field distribution and quality factor of both of the PhC-cavities, enabling the structure to be comprehended as an optical switch. Soft PhCs in the form of chiral liquid crystals are also used for obtaining certain properties of the optical switch, as described in [52], while through effects of physics in terms of parity-time symmetry and topological insulators in [53], using phase change nanomaterials [54], air-trench [55] and carrier diffusion and recombination processes in PhCs [56], with the design based on 3D Micro-Electro-Mechanical-Systems (MEMS) reported in [57].…”

Section: Introductionmentioning

confidence: 99%

A 3-Dimensional Modelling of the Optical Switch Based on Guided Mode Resonances in Photonic Crystals

Rehman¹,

Khan²,

Irfan³

et al. 2023

Preprint

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Optical switching is an essential part of photonic integrated circuits and the focus of research at the moment. In this research, an optical switch design working on the phenomenon of the guided-mode resonances in 3D photonic crystals-based structure is reported. The optical-switching mechanism is studied in a dielectric slab-waveguide-based structure operating in the near-infrared range in a telecom window of 1.55 µm. The mechanism is investigated by interference of two signals, i.e., the data signal and the control signal. The data signal is coupled into the optical structure and filtered utilizing guided-mode resonance, whereas, the control signal is index guided in the optical structure. The amplification or de-amplification of the data signal is controlled by tuning the spectral properties of the optical sources and structural parameters of the device. The parameters are optimized first using a single-cell model with periodic boundary conditions and later in a finite 3D-FDTD model of the device. The numerical design is computed in an open-source Finite Difference Time Domain simulation platform. Optical amplification in the range of 13.75 % is achieved in the data signal with a decrease in the linewidth up to 0.0079 µm and a quality factor of 114.58. The proposed device presents great potential in the field of photonic integrated circuits, biomedical technology, and programmable photonics.

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“…[8] Photonic crystals are composed of fixed periodic subwavelength structures, which determine their band structure. Once the photonic crystal is produced, the band structure can be tuned by controlling the refractive index of the elements or their surroundings [9][10][11][12][13][14] by changing the optical properties of the material with nonlinear material's response, [15] using phase changing materials, [16,17] applying mechanical stress, [18,19] or changing temperature. [20] Nevertheless, reconfiguring the geometry and symmetry of the unit cells of the photonic crystals beyond the tuning of the operational frequencies remains a challenge.…”

Section: Introductionmentioning

confidence: 99%

Pixelated Photonic Crystals

Mur

Ravnik

2023

Advanced Photonics Research

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Photonic crystals can prevent or allow light of certain frequencies to propagate in distinct directions in anomalous and useful ways for use as waveguides, laser cavities, and topological light propagation. However, there exist limited approaches for fundamental reconfiguration of photonic crystals, such as changing the unit cell to various and on‐demand geometries and symmetries. This work introduces the concept of pixelated 2D photonic crystals where the variability of the dielectric profile is achieved by a pixelated matrix of the material. Specifically, the cross sections of dielectric cylindrical pillars distributed in a photonic crystal lattice are replaced with pixelated circles using different resolutions and the corresponding band diagrams are calculated. The comparison to the band diagrams of the original structure shows that the original—and today typically used—cylindrical design can be well approximated by as few as square switchable pixels while retaining less than change in the photonic band structure. Experimental realization of switchable pixelation is proposed based on the liquid crystal display (LCD) technology with high birefringence materials. More generally, the demonstrated approach to reconfigurable 2D photonic crystal based on switchable pixels can enable realization of diverse fundamentally reconfigurable advanced optical materials.

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Numerical Investigation of Reconfigurable Photonic Crystal Switch Based on Phase Change Nanomaterial

Cited by 18 publications

References 30 publications

Pixelated photonic crystals for THz applications

Pixelated photonic crystals for THz applications

A 3-Dimensional Modelling of the Optical Switch Based on Guided Mode Resonances in Photonic Crystals

Pixelated Photonic Crystals

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