Ultracompact Polarization Rotator Based on Liquid Crystal Channel on Silicon

Hameed, Mohamed Farhat O.; Hussain, Firas Faeq K.

doi:10.1109/jlt.2017.2686780

Cited by 13 publications

(7 citation statements)

References 56 publications

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“…Nylon 6 layer can be mechanically rubbed to obtain a uniform alignment of the NLC molecules in the desired direction. Nylon 6 is created as a thin photo-alignment layer on a glass plate to improve the planar, homogenous alignment of the NLC molecules 34 . Another layer of D263 glass with a thickness of 1.5 μm and a refractive index of 1.506 is placed on top of the thin Naylon 6 layer to enclose the NLC material and features a top cladding 35 .…”

Section: Introductionmentioning

confidence: 99%

Asymmetric dual-core liquid crystal channel-based tunable mode converter

Esmail,

Hameed,

Obayya

et al. 2024

Sci Rep

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In this work, a higher order-to-fundamental mode converter is reported and analyzed based on an asymmetric dual channel waveguide (ADC-WG) on silicon. In the reported structure, one of the two waveguides is infiltrated with nematic liquid crystal (NLC) material to add temperature tunability while the other one is a solid BK7 waveguide. The modal characteristics are obtained using the full vectorial finite difference method (FVFDM). In addition, the structural parameters and optical characteristics of the employed materials are investigated to achieve good wavelength selectivity with a short device length (LD). Thus, a compact mode converter that can work at different wavelengths including the telecommunication wavelength i.e., 1.55 μm with LD ~ 482.31 μm and a low crosstalk of − 19.86 dB is presented. To prove the thermal tunability of the suggested mode converter, its operation is tested through a temperature range between 20 and 35 °C and the results show that the mode conversion process is achieved at each temperature with different phase matching wavelengths (λPMW) but with quite similar coupling length (LC). The proposed device can therefore be effectively utilized in integrated photonic circuits.

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Section: Introductionmentioning

confidence: 99%

Asymmetric dual-core liquid crystal channel-based tunable mode converter

Esmail,

Hameed,

Obayya

et al. 2024

Sci Rep

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“…Polarization rotators [ 1 , 2 , 3 , 4 , 5 ] are an essential component in optical fiber communication systems for applications such as the circulator [ 6 , 7 ]. The polarization rotators formed by metasurfaces or metamaterials have also been studied [ 8 , 9 , 10 , 11 , 12 , 13 ].…”

Section: Introductionmentioning

confidence: 99%

“…For the integrated optical polarization rotators, asymmetric cross-sections of the waveguide produce the horizontal and vertical polarization modes. The birefringence of the two eigenmodes of the waveguide, which are oriented at 45° with respect to the wafer axis, results in the coupling between two eigenmodes and the polarization rotation [ 1 , 2 , 3 , 4 , 5 ]. In high-power, short-pulse laser systems, high-precision reflective polarization rotators are required to provide a higher accuracy and a higher damage threshold [ 16 ].…”

Section: Introductionmentioning

confidence: 99%

Design of Reflective Polarization Rotator in Silicon Waveguide

et al. 2022

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In this work, we investigate theoretically the reflective polarization rotator in a silicon waveguide formed by periodically arranged rectangular air holes. The etched air holes generate the large birefringence for the waveguide. The effective refractive index of the non-etched waveguide is isotropic. The structure can be regarded as a stack of alternating birefringent waveplates and isotropic material similar to the folded Šolc filter. The band structure of the stack of birefringent waveplates with isotropic background is calculated to confirm the fact that high reflection peaks in the reflection spectra of the waveguide result from the photonic bandgap. The polarization extinction ratio for the reflected light is 15.8 dB. The highest reflectivity of the device is 93.1%, and the device length is 9.21 μm. An ultra-wide operation bandwidth from 1450.3 to 1621.8 nm can be achieved.

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“…Liquid crystal (LC) is a feasible option to manipulate SPPs on a subwavelength scale, because the tilt angle of its optical axis can be controlled by applied voltage [19]. In the past few years, due to its electronic birefringence and low power consumption in near infrared region (NIR), LC is widely used in modulation devices such as optofluidic filter [20] and polarization rotator [21].…”

Section: Introductionmentioning

confidence: 99%

Plasmonic Demultiplexer With Tunable Output Power Ratio Based on Metal-Dielectric-Metal Structure and E7 Liquid Crystal Arrays

Wang

Cheng

et al. 2020

IEEE Photonics J.

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A novel tunable plasmonic demultiplexer is proposed and numerically investigated by finite element method (FEM). It consists of two half-nanodisk cavities and two sets of E7 liquid crystal arrays which are side-coupled to three metal-dielectric-metal (MDM) waveguides. The demultiplexer can split the input lights into two parts corresponding to port1 (1310 nm) and port2 (1550 nm). The Q-factors of port1 and port2 are 54.6 and 36, and the crosstalk values are −20.7 dB and −29.9 dB, respectively. Obviously, both channels have high Q-factors and low crosstalk value. Moreover, the E7 liquid crystal arrays play a key role in the whole structure, which makes the output power adjustable proportionally by adjusting the applied voltage. This novel feature greatly enriches the function of our demultiplexer. Using the electronical tunable birefringence characteristic of liquid crystal and its arrays structure paves a new way to realize practical on-chip plasmonic system, which can be widely used not only in demultiplexers but also in nanosensors, optical splitters, filters, optical switches, nonlinear photonic and slow-light devices.

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Ultracompact Polarization Rotator Based on Liquid Crystal Channel on Silicon

Cited by 13 publications

References 56 publications

Asymmetric dual-core liquid crystal channel-based tunable mode converter

Asymmetric dual-core liquid crystal channel-based tunable mode converter

Design of Reflective Polarization Rotator in Silicon Waveguide

Plasmonic Demultiplexer With Tunable Output Power Ratio Based on Metal-Dielectric-Metal Structure and E7 Liquid Crystal Arrays

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