Parameters for efficient growth of second harmonic field in nonlinear photonic crystals

Joseph, Shereena; Khan, Mohd. Shahid; Hafiz, Aurangzeb Khurram

doi:10.1016/j.physleta.2014.02.032

Cited by 7 publications

(1 citation statement)

References 27 publications

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“…Since the selected dielectric medium possesses a high nonlinear coefficient, the extraordinary confinement of optical energy within the medium can offer interesting nonlinear optical processes. [36,58,59] Therefore, improved Q-factor with high field confinement in the nonlinear chalcogenide medium can provide the unique possibility of engineering the nonlinear optical process such as absorption, harmonic generation, selffocusing, and bistability. Apart from it, the better Q-factor of the resonance dip also can demonstrate sensing applications.…”

Section: Resultsmentioning

confidence: 99%

Exploring the Optical Bound State in the Continuum in a Dielectric Grating Coupled Plasmonic Hybrid System

Joseph

Sarkar

Khan

et al. 2021

Advanced Optical Materials

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the hybridized modes arising from the coupling of photonic and plasmonic resonances have been investigated widely. [7] The hybridized modes realized in diverse configurations using defect modes, [8] plasmonic nano-cavities, [9] Fabry-Perot metallic trench resonator, [10] etc., successfully demonstrate improved outcomes in terms of sensitivity, figure of merit, confinement, and lightmatter interaction. [11] Very recently, it has been noticed that the interaction of two different optical channels leads to the formation of a bound state in the continuum (BIC) and a resultant quasi-BIC hybrid mode. [12] The BIC is considered as a confined state in an open system with an infinite quality factor (Q-factor), which can extensively interact with the radiation channel. [13] Although the concept of BIC was proposed by von Neumann and Wigner in 1921, [14] the experimental observation of its existence is manifested only in the last decades. [15,16] Nevertheless, a true BIC is a mathematical perception that one can never achieve with either quantum or classical systems using physical parameters. [16] Fundamentally, the BICs can be of two kinds; the symmetry protected BIC (SP-BIC) [4,17,18] and the accidental BICs. [19] The SP-BICs are the inherent nature of a wave system; they are the discrete modes in the Brillouin zone near the gamma (Γ) point and are not allowed to interact with the free space radiation due to its symmetry incompatibilities. [17] Conversely, the accidental BICs are the consequence of the interference phenomena. For a system with two different resonance phenomena continuously changing with the parametric variation, at one particular set of parameters, there may occur an avoided crossing through which both the modes can interact and interfere destructively, resulting in the vanishing of one of the modes with an infinite quality factor. [19] Such an accidental vanishing of modes is explained by the Friedrich-Wintgen scenario. [20] The SP-BIC can be accessed by symmetry breaking structure [21] or by oblique illumination, resulting in the generation of resonant modes with a huge Q-factor called the quasi-BIC. [22] Although a true BIC mode is a dark mode with infinite lifetime and zero line width, in reality, the Q-factor of the BIC is finite because of restricted dimension, losses, and imperfection in the fabricated system. Thus, only the quasi-BICs with finite spectral width and Q-factor can be realized experimentally. The quasi-BIC has been explored for numerous applications including compact photonic chip for communication, [23] extreme narrowband transmission spectrum, [4] lasing, [24] The bound state in the continuum (BIC) explores the extraordinary optical properties of a system possessing wave characteristics that gained recent importance for practical applications, including lasing, sensing, optical tweezing, nonlinear interactions, and many more. Unlike a pure optical or plasmonic system, a hybrid architecture with coupled photonicplasmonic characteristics can offer the intermittent resonant modes for s...

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Section: Resultsmentioning

confidence: 99%

Exploring the Optical Bound State in the Continuum in a Dielectric Grating Coupled Plasmonic Hybrid System

Joseph

Sarkar

Khan

et al. 2021

Advanced Optical Materials

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Advances in Photonic Crystal Research for Structural Color

Chen,

Wei,

Pan

et al. 2024

Adv Materials Technologies

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Structural color is a remarkable physical phenomenon that exists widely in nature. Unlike traditional color rendering methods, they are realized mainly through micro/nanostructures that interfere, diffract, scatter light, and exhibit long‐life and environmental‐friendly color effects. In nature, a few organisms use their color‐changing system to transmit information, such as courtship, warning, or disguise. Meanwhile, some natural inorganic minerals can also exhibit structural colors. Learning from nature, scientists have achieved large‐scale structural color design and manufacturing technology for artificial photonic crystals. Photonic crystals have a unique microstructure that forms a band gap under the action of the periodic potential field, consequently causing Bragg scattering due to the periodic arrangement of different refractive index media within them. Because of the apparent photonic band gap and the ability to form local photons at crystal defects, photonic crystals have been extensively studied in recent years and have broad application prospects in photonic fibers, optical computers, chips, and other fields. In this review, the research, properties, and applications of photonic crystals in recent years are presented, as well as insight into the future developments of photonic crystals.

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