Manipulating femtosecond pulse shape using liquid crystals infiltrated one-dimensional graded index photonic crystal waveguides composed of coupled-cavities

Khalkhali, T. Fathollahi; Bananej, Alireza

doi:10.1016/j.physleta.2017.08.022

Cited by 7 publications

(1 citation statement)

References 21 publications

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“…In 2015, Wahle et al proposed a LC infiltrated PC fiber to enable the electrical tuning of the position of zero dispersion wavelengths [25]. In 2016, Khalkhali et al studied the variation of complete band gap by changing the optical axis orientation of LC [26], and in 2017 they realized the transmit of an ultrashort pulse shape with negligible distortion and attenuation in graded index LC PC coupled-cavity waveguide [27]. Very recently, tuning light focusing with LC infiltrated graded index PC was realized by applying an external electric field [28].…”

Section: Introductionmentioning

confidence: 99%

Electrically controlled beam steering with wide deflection angles in liquid crystal photonic crystals

Liang

Chen

2018

J. Opt.

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Electrically controlled beam steering behaviors in a 2D square photonic crystal (PC) composed of Si cylinders surrounded by nematic liquid crystal are studied. The results show that by applying an external saturated electric field, the structure becomes anisotropic and results in remarkable change of band structure to produce a single band from 0.3105 to 0.3245(c/a) accordingly. This special single band is high anisotropic and only allows one mode with negative refraction to be excited in the ГM direction. Further studies show that as the external saturated electric field rotates from 0° to 90°, the equifrequency contours of the single band deform continuously from rectangle-like to parallelogram-like shapes, and then recover to rectangle-like shapes but with the long-side rotated by 90°. Moreover, we demonstrate continuous tunable beam steering behaviors with wide deflection angles from −38° to +38° at normal incidence by finite-difference time-domain simulations. These results have the potential for designing various tunable PC devices.

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Section: Introductionmentioning

confidence: 99%

Electrically controlled beam steering with wide deflection angles in liquid crystal photonic crystals

Liang

Chen

2018

J. Opt.

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Tunable coupling coefficient in the lens-waveguide coupled photonic crystal structures

Khalkhali

Zareian

2022

Indian J Phys

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Design of Flat Defects’ Band in One-Dimensional Coupled-Cavity Photonic Crystal Waveguides for Transmitting Ultrashort Pulses

et al. 2020

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In the present study, the transmission characteristics of ultrashort pulses through coupled-cavity waveguides in one-dimensional photonic crystals were investigated theoretically, using finite-difference time-domain and transfer matrix methods. By controlling the configuration of the waveguides, a flat defects' band can be obtained in the transmission spectra, which can be used for passing ultrashort pulses. The conditions for achieving a flat defects' band are derived by optimization geometrical parameters of the waveguides. The optimized structure is able to transmit ultrashort pulses, up to 30 fs, with negligible distortion and attenuation. Unlike the previously designed waveguides with the same application, we designed our system without using graded index materials or many thin film layers.

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Manipulating femtosecond pulse shape using liquid crystals infiltrated one-dimensional graded index photonic crystal waveguides composed of coupled-cavities

Cited by 7 publications

References 21 publications

Electrically controlled beam steering with wide deflection angles in liquid crystal photonic crystals

Electrically controlled beam steering with wide deflection angles in liquid crystal photonic crystals

Tunable coupling coefficient in the lens-waveguide coupled photonic crystal structures

Design of Flat Defects’ Band in One-Dimensional Coupled-Cavity Photonic Crystal Waveguides for Transmitting Ultrashort Pulses

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