Characterization of one dimensional liquid crystal photonic crystal structure

Mohamed, Mohmoud; Hameed, Mohamed Farhat O.; El-Okr, Mohamed; Obayya, S. S. A.

doi:10.1016/j.ijleo.2016.06.101

Cited by 14 publications

(7 citation statements)

References 25 publications

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“…As a result, PC/LC cells have shown promise for a variety of applications. In terms of the optical switchable mechanism based on the stimuli-responsive material properties of LCs through the electrically controlled birefringence effect and other field effects, potential applications of LC-induced defect modes in one-dimensional (1D) hybrid PCs have been suggested, including optically pumped lasers [7,8], filters [9,10], optical switches [11][12][13][14], optical communications [15,16], and beyond. In addition to the use of an applied electric field, the tuning of defect modes can be further fulfilled by dominating their transmission through magnetic fields [17][18][19][20], temperatures [21][22][23], and variations in the angle of incidence of light [24,25].…”

Section: Introductionmentioning

confidence: 99%

Electrically Tunable Defect-Mode Wavelengths in a Liquid-Crystal-in-Cavity Hybrid Structure in the Near-Infrared Range

et al. 2023

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This work proposes a novel approach to developing a core component for a near-infrared (NIR) spectrometer with wavelength tunability, which is based on a liquid crystal (LC)-in-cavity structure as a hybrid photonic crystal (PC). By electrically altering the tilt angle of the LC molecules under applied voltage, the proposed PC/LC photonic structure consisting of an LC layer sandwiched between two multilayer films generates transmitted photons at specific wavelengths as defect modes within the photonic bandgap (PBG). The relationship between the number of defect-mode peaks and the cell thickness is investigated using a simulated approach based on the 4 × 4 Berreman numerical method. Furthermore, the defect-mode wavelength shifts driven by various applied voltages are studied experimentally. To minimize the power consumption of the optical module for spectrometric application, cells of different thicknesses are explored for the wavelength-tunability performance of the defect modes scanning through the entire free spectral ranges to the wavelengths of their next higher orders at null voltage. A 7.9 μm thick PC/LC cell is verified to attain the low operating voltage of merely 2.5 Vrms required to successfully cover the entire NIR spectral range between 1250 and 1650 nm. The proposed PBG structure is thus an excellent candidate for application in monochromator or spectrometer development.

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Section: Introductionmentioning

confidence: 99%

Electrically Tunable Defect-Mode Wavelengths in a Liquid-Crystal-in-Cavity Hybrid Structure in the Near-Infrared Range

et al. 2023

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“…Also, the PBG of PCs with LC as defect layer can be tuned by applying external eld and temperature, LC defect PCs show tunable transmission that depends upon the orientation director of LC molecules under the electric elds [26][27][28][29][30][31][32][33]. Mohamed et al [34] investigated the consequences of the LC director tilt angle and temperature on the transmission of 1DPS with the LC defect layer. Moreover, the nonlinear and linear properties of 1DPS with LC have been investigated by Entezar et al [35] and reported that the temperature and threshold intensity of LCs layer dependent transmission properties of the 1DPS.…”

Section: Introductionmentioning

confidence: 99%

Theoretical Investigation of Coupling of Surface Plasmons in One-dimensional Periodic Structure of SiO2 and TiO2 with Defect of Nanocomposite of Liquid Crystals and Core–Shell Nanoparticles

Gupta

Singh²,

Thapa³

et al. 2022

Plasmonics

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In this work, we theoretically investigate the coupling of localized surface plasmons resonances (LSPRs) of core-shell nanoparticles embedded in the host liquid crystal, where the near eld enhancement in the host matrix tunes the optical properties. The effect of different radii of spherical core-shell nanoparticles of silver core and silicon shell (Ag@Si) in the E7 liquid crystals is also discussed. The coupling of LSPRs through the near eld enhancement in the E7LC + Ag@Si nanocomposite (NC) layer yields to tune the optical transmissions. LPSRs depend on the radii of core-shell structures shows redshift and blue shifts in which controlled transmissions of one-dimensional photonic crystals (1-DPCs) with defect of NC layer have been discussed using transfer matrix method (TMM) in this study. The lling fractions of core-shell nanostructure and the incident angles of the electromagnetic wave also affect the transmission properties of designed 1-DPC with a structure (TiO 2 |SiO 2 ) 5 |NC|(TiO 2 |SiO 2 ) 5 . The studies of proposed structure reveal to design the energy e cient optical lters, sensors, solar cells, photo-detectors and alloptical switching devices.

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“…The semiconductor nanowires of small diameters make them attractive for potential quantum confinement effects, while their unconstrained lengths make it easy to integrate them into already existing devices. This escalated the interest in 1D nanostructures for all kinds of potential applications (photocatalysts [ 22 ], magnetic storage medium [ 23 ], nanoscale sensors [ 24 ], optical devices [ 25 ], solar cells [ 26 ], liquid crystal devices [ 27 ], etc.). In particular, research into group IV semiconductor nanowires has been of high interest since the beginning of the 2000s [ 28 ].…”

Section: Introductionmentioning

confidence: 99%

A Review of Self-Seeded Germanium Nanowires: Synthesis, Growth Mechanisms and Potential Applications

2021

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Ge nanowires are playing a big role in the development of new functional microelectronic modules, such as gate-all-around field-effect transistor devices, on-chip lasers and photodetectors. The widely used three-phase bottom-up growth method utilising a foreign catalyst metal or metalloid is by far the most popular for Ge nanowire growth. However, to fully utilise the potential of Ge nanowires, it is important to explore and understand alternative and functional growth paradigms such as self-seeded nanowire growth, where nanowire growth is usually directed by the in situ-formed catalysts of the growth material, i.e., Ge in this case. Additionally, it is important to understand how the self-seeded nanowires can benefit the device application of nanomaterials as the additional metal seeding can influence electron and phonon transport, and the electronic band structure in the nanomaterials. Here, we review recent advances in the growth and application of self-seeded Ge and Ge-based binary alloy (GeSn) nanowires. Different fabrication methods for growing self-seeded Ge nanowires are delineated and correlated with metal seeded growth. This review also highlights the requirement and advantage of self-seeded growth approach for Ge nanomaterials in the potential applications in energy storage and nanoelectronic devices.

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Characterization of one dimensional liquid crystal photonic crystal structure

Cited by 14 publications

References 25 publications

Electrically Tunable Defect-Mode Wavelengths in a Liquid-Crystal-in-Cavity Hybrid Structure in the Near-Infrared Range

Electrically Tunable Defect-Mode Wavelengths in a Liquid-Crystal-in-Cavity Hybrid Structure in the Near-Infrared Range

Theoretical Investigation of Coupling of Surface Plasmons in One-dimensional Periodic Structure of SiO2 and TiO2 with Defect of Nanocomposite of Liquid Crystals and Core–Shell Nanoparticles

A Review of Self-Seeded Germanium Nanowires: Synthesis, Growth Mechanisms and Potential Applications

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