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Gap Solitons in Photorefractive Optical Lattices
Published in Arpan Deyasi, Pampa Debnath, Asit K. Datta, Siddhartha Bhattacharyya, Photonics, Plasmonics and Information Optics, 2021
A centrosymmetric crystal is one which possesses inversion symmetry or an inversion centre as a symmetry element. The first discovery of stable optical spatial solitons in PR materials was in noncentrosymmetric crystals like SBN. The mediating nonlinearity was because of the linear electro-optic effect or the Pockels’ effect. The Pockels’ effect mandates the change in refractive index is proportional to the electric field. Optical spatial solitons in centrosymmetric PR crystals were later predicted by Segev et al.[13]. Centrosymmetric PR crystals exhibit quadratic electro-optic effect or the dc Kerr effect in which the refractive index changes as the square of field, i.e.Δn α E2. The gap solitons in such centrosymmetricPR materials have been studied in [12] and we shall follow the same approach to introduce the topic to the reader.
Basic Electrical Measurements
Published in Robert B. Northrop, Introduction to Instrumentation and Measurements, 2018
There are several, possible, electro-optical approaches to the problem of measuring DC electric fields. One is to measure the change in the linear polarization of light transmitted through a quartz crystal subject to an electric field applied across a preferred axis. This phenomenon is called the electrogyration effect (Rogers 1977). Another electro-optical method proposed for measuring DC electric field strength makes use of the Pockels effect, in which the application of an electric field along the privileged axis of the crystal causes changes in the refractive indices along two orthogonal axes (x and y). Certain crystalline substances, such as ammonium dihydrogen phosphate (ADP), potassium dihydrogen phosphate (KDP), cuprous chloride (CuCl), cadmium telluride (CdTe), and gallium arsenide (GaAs), exhibit the Pockels effect.
Experimental results of study of reflected harmonic in silicon
Published in O.A. Aktsipetrov, I.M. Baranova, K.N. Evtyukhov, Second Order Non-linear Optics of Silicon and Silicon Nanostructures, 2018
O.A. Aktsipetrov, I.M. Baranova, K.N. Evtyukhov
In conclusion, we will focus on the work [161] in which, apparently, the authors were first to reported observation of the Pockels effect in silicon MIS structures and the very interesting effect in terms of non-linear optics – optical rectification effect. The Pockels effect is the appearance of induced birefringence in an electric field. The Pockels effect, in contrast to the quadratic Kerr effect, is linear in the applied field, i.e., the change of the components of the tensor of the linear dielectric constant ε↔L(or its inverse optical impermeability tensor η↔=(ε↔L)−1) is directly proportional to the applied field. The Pockels effect is forbidden in the centrosymmetric medium, but may occur in the surface area of silicon when removing the inversion by applying an external electric field. Optical rectification (OR) is the appearance of stationary NP P(0) in propagation of an intense light wave in the medium.
Measurement of high-power transient electromagnetic pulse field with integrated photonic electric-field sensor
Published in Instrumentation Science & Technology, 2023
Xianli Li, Yi Cui, Gaolong Yao, Yongzhen Xi, Xiaoran Hai
In our previous study, we reported an asymmetric Mach–Zehnder interferometer-based integrated optical electric-field sensor.[14] In this sensor, the Pockels effect of lithium niobite (LiNbO3) crystals was exploited, and the external electric field was detected via the demodulation of the interference light intensity traveling around the LiNbO3 waveguide. The proposed sensor offered remarkable advantages such as a metal-free structure, wide frequency bandwidth, large measurable range, and compact size.[15–17] Furthermore, signal transmission via silica fibers provides low propagation loss over long distance and excellent electromagnetic immunity, thus being attractive for use in high-power EMP field measurements.
Propagation properties of Airy–Gaussian beams in centrosymmetric photorefractive media
Published in Journal of Modern Optics, 2018
Qichang Jiang, Yanli Su, Ziwei Ma, Wei Zheng, Yonghong Li, Hexian Nie
Moreover, the photorefractive media are excellent platform to study the propagation properties of optical beams, because of their remarkable nonlinearity at low input light intensity (21–25). As we all know, there are two types of photorefractive media i.e. centrosymmetric and non-centrosymmetric photorefractive media. In non-centrosymmetric photorefractive media, the nonlinearity is the linear electro-optic effect i.e. Pockels effect, but the nonlinearity is the quadratic electro-optic effect i.e. dc Kerr effect in centrosymmetric photorefractive media (25). To the best of our knowledge, the propagation properties of AiG beams in non-centrosymmetric photorefractive media with the linear electro-optic effect have been reported (17, 19), but the case of centrosymmetric photorefractive media with the quadratic electro-optic effect has not been reported. Therefore, in this paper, we will investigate numerically the propagation and interaction properties of AiG beams in biased centrosymmetric photorefractive media.
Optical response properties of a hybrid electro-optomechanical system interacting with a qubit
Published in Journal of Modern Optics, 2022
Tarun Kumar, Surabhi Yadav, Aranya B. Bhattacherjee
Electro-optic modulators (EOMs) used in optical communication systems have the ability to modulate an optical field using an electric field. One of the major challenge to implement such an EOM is low power consumption [78]. EOMs based on Pockels effect and Kerr effect require large components together with high driving voltage [79,80], leading to high energy dissipation [81]. EOMs based on the electro-absorption effects are also not fully successful due to the weakness of the electro-optic absorption effect [82]. These limitations led to a novel proposal of a hybrid EOM system composed of a three-level medium confined inside a tunable cavity coupled to an electro-mechanical system [83].