https://ojs.wiserpub.com/index.php/top <p><em>Transactions in Optics and Photonics</em> (TOP) is a comprehensive, open-access, peer-reviewed journal that serves as a platform for researchers, scientists, and engineers to publish their latest findings, advancements, and innovations in optics and photonics. It aims to facilitate the sharing of cutting-edge research, theoretical advancements, experimental findings, and practical applications within the field.</p> <p>The topics of the journal are from all areas of optics, including modern optics, quantum optics, nonlinear optics, fiber optics, optical physics, Fourier optics, spectroscopy, ultra-fast optics, X-ray optics, atmospheric optics, oceanic optics, geometrical optics, statistical optics, surface optics, optoelectronics, detectors, diffraction and gratings, paraxial waves, holography, image processing, pattern recognition, polarimetry, microscopy, optical data storage, optical devices, remote sensing, astronomical optics, optical engineering, surface photochemistry and thermal lensing, etc. Click <a href="https://ojs.wiserpub.com/index.php/TOP/about"><u>here</u></a> to know more details. </p> <p> </p> Universal Wiser Publisher en-US Transactions in Optics and Photonics https://ojs.wiserpub.com/index.php/top/article/view/9614 <p>Concentration quenching is a common problem in organic luminescent materials, significantly reducing the efficiency of luminescent devices and luminescence-based tools. Although the mechanism of this phenomenon has been studied for a long time, it remains still not fully understood. It is a great challenge to find the most efficient ways to diminish or to overcome concentration quenching. This mini-review examines the progress made in biological and optoelectronic research to address this problem, mainly over the last decade. All known mechanisms of concentration quenching (except for light reabsorption and energy migration) are based on intermolecular interactions. Thus, to prevent or diminish concentration quenching of luminescence in organic molecules, one can only remove or reduce short-range interactions between the emitting molecules. Internal (adjusting the mutual orientation of the emitting molecules, designing molecules with bulky side chains, and sterically wrapping additional molecular parts, which results in increasing the distance between molecules) and external (host-guest systems, which isolate emitting molecules by means of creating a shielding barrier between them) tools for minimizing concentration quenching are considered. Shielding barriers can be obtained by doping and encapsulating molecules. Organic, metal-organic, and inorganic cages, organic, metal-organic, and inorganic frameworks, polymeric and inorganic nanoporous materials, as well as carbon and other nanomaterials, are being successfully developed for dye encapsulation. All the proposed tools have resulted in diminishing concentration quenching. However, for further progress in overcoming of concentration quenching, a series of new proposed approaches such as the synthesis of new sterically wrapped and Aggregation-Induced Emission (AIE) molecules, hyperfluorescent structures, and the embedding of luminescent molecules into organic, metal-organic, inorganic, and carbon-based cages as well as covalent organic and metal-organic frameworks are considered to be the most prospective, because they make it possible to apply the highest concentrations without essential luminescence quenching.</p> Alexander Kukhta Copyright (c) 2026 Alexander Kukhta https://creativecommons.org/licenses/by/4.0 2026-06-17 2026-06-17 137 150 https://ojs.wiserpub.com/index.php/top/article/view/9836 <p>MetaMaterials (MMs) offer strong tunability of optical properties, enabling diverse photonic applications. We investigate the role of tunable optical nonlinearities in the formation of Tightly Focused Beam (TFB). The system is described by a nonlinear Schrödinger equation, and modulation instability is analyzed both analytically and numerically to identify parameter regimes supporting localized beam formation. The dynamics of Gaussian and hollow Gaussian beams are further studied using numerical simulations, with emphasis on TFB generation. Results show that adjustable nonlinearities in MMs significantly enhance control over beam focusing characteristics. Notably, hollow Gaussian beams generate higher-intensity TFB clusters compared to standard Gaussian beams. These findings suggest potential applications in optical trapping and high-density data storage.</p> N. K. Hashim Mustafa Bayram A. K. Shafeeque Ali Gopi Somasundaram Copyright (c) 2026 N. K. Hashim, Mustafa Bayram, A. K. Shafeeque Ali, Gopi Somasundaram https://creativecommons.org/licenses/by/4.0 2026-06-17 2026-06-17 151 163