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Dear Colleagues,

Photonics refers to the study and application of the physical science of light. Photonic devices are components for creating, manipulating, or detecting light. Examples include laser diodes, light-emitting diodes, switches, solar and photovoltaic cells, displays, and optical amplifiers. Moreover, optoelectronics is a rapidly developing technological discipline that involves the utilization of electronic devices to source, detect, and manipulate light. These devices can be a component of numerous applications, including military services, automatic access control systems, telecommunications, medical equipment, and more. Since this discipline is so wide, the spectrum of devices that come under optoelectronics is enormous, including image pick-up devices, LEDs and elements, information displays, optical storage, remote sensing systems, and optical communication systems. In this Special Issue, reviews and novel research papers on the topic are welcome, as are interdisciplinary works.

Dr. Muhammad Ali Butt
Prof. Dr. Sotirios Baskoutas
Guest Editors

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Published Papers (2 papers)

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Research

16 pages, 8977 KiB

Open AccessArticle

Extending the Depth of Focus of an Infrared Microscope Using a Binary Axicon Fabricated on Barium Fluoride

by Molong Han, Daniel Smith, Tauno Kahro, Dominyka Stonytė, Aarne Kasikov, Darius Gailevičius, Vipin Tiwari, Agnes Pristy Ignatius Xavier, Shivasubramanian Gopinath, Soon Hock Ng, Aravind Simon John Francis Rajeswary, Aile Tamm, Kaupo Kukli, Keith Bambery, Jitraporn Vongsvivut, Saulius Juodkazis and Vijayakumar Anand

Micromachines 2024, 15(4), 537; https://0-doi-org.brum.beds.ac.uk/10.3390/mi15040537 - 17 Apr 2024

Viewed by 381

Abstract

Axial resolution is one of the most important characteristics of a microscope. In all microscopes, a high axial resolution is desired in order to discriminate information efficiently along the longitudinal direction. However, when studying thick samples that do not contain laterally overlapping information, a low axial resolution is desirable, as information from multiple planes can be recorded simultaneously from a single camera shot instead of plane-by-plane mechanical refocusing. In this study, we increased the focal depth of an infrared microscope non-invasively by introducing a binary axicon fabricated on a barium fluoride substrate close to the sample. Preliminary results of imaging the thick and sparse silk fibers showed an improved focal depth with a slight decrease in lateral resolution and an increase in background noise. Full article

(This article belongs to the Special Issue Photonic and Optoelectronic Devices and Systems, Second Edition)

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14 pages, 9014 KiB

Open AccessFeature PaperEditor’s ChoiceArticle

Micro-Ring Resonator-Based Tunable Vortex Beam Emitter

by Liaisan I. Bakirova, Grigory S. Voronkov, Vladimir S. Lyubopytov, Muhammad A. Butt, Svetlana N. Khonina, Ivan V. Stepanov, Elizaveta P. Grakhova and Ruslan V. Kutluyarov

Micromachines 2024, 15(1), 34; https://0-doi-org.brum.beds.ac.uk/10.3390/mi15010034 - 23 Dec 2023

Cited by 1 | Viewed by 1060

Abstract

Light beams bearing orbital angular momentum (OAM) are used in various scientific and engineering applications, such as microscopy, laser material processing, and optical tweezers. Precise topological charge control is crucial for efficiently using vortex beams in different fields, such as information encoding in optical communications and sensor systems. This work presents a novel method for optimizing an emitting micro-ring resonator (MRR) for emitting vortex beams with variable orders of OAM. The MRR consists of a ring waveguide with periodic structures side-coupled to a bus waveguide. The resonator is tunable due to the phase change material Sb₂Se₃ deposited on the ring. This material can change from amorphous to crystalline while changing its refractive index. In the amorphous phase, it is 3.285 + 0i, while in the transition to the crystalline phase, it reaches 4.050 + 0i at emission wavelength 1550 nm. We used this property to control the vortex beam topological charge. In our study, we optimized the distance between the bus waveguide and the ring waveguide, the bending angle, and the width of the bus waveguide. The optimality criterion was chosen to maximize the flux density of the radiated energy emitted by the resonator. The numerical simulation results proved our method. The proposed approach can be used to optimize optical beam emitters carrying OAM for various applications. Full article

(This article belongs to the Special Issue Photonic and Optoelectronic Devices and Systems, Second Edition)

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