Article
Optics
E. Mendicuti, O. Kaeferlein, C. Garcia-Segundo
Summary: This study introduces a proof of concept for multimode random laser emission using fresh whole blood, showing that blood can emit laser under specific conditions. The experimental results demonstrate that the laser emission characteristics of blood are similar to traditional laser media.
Article
Chemistry, Multidisciplinary
Hongfeng Ma, Nicolas Dalloz, Amaury Habrard, Marc Sebban, Florian Sterl, Harald Giessen, Mathieu Hebert, Nathalie Destouches
Summary: This article explores the use of deep neural networks and laser processing technology to predict the optical properties of laser-induced plasmonic metasurfaces and achieve printing image multiplexing. The study validates the effectiveness of the deep learning approach and provides a simple mining algorithm for implementing multiplexing with multiple observation modes and colors. This research is important for optimizing laser processes in high-end applications such as security, entertainment, or data storage.
Article
Optics
Hristo Kisov, Kiril Blagoev, Vani Tankova, Biliana Georgieva, Velichka Strijkova, Petia Petrova, Georgi Dyankov
Summary: Our study investigates the nonlinear lasing properties of a solid-state dye laser that utilizes a xanthene dye-functionalized epoxy resin polymer for gain. The reproducible emission spectrum observed can be attributed to non-degenerate cascaded four-wave mixing in the gain medium. The pump beams are generated simultaneously in the isotropic active medium, resulting in downshift and upshift modes through coherent pump beams. This experiment demonstrates highly nondegenerate cascaded four-wave mixing in a random gain medium within the visible spectral range, which has not been previously reported.
OPTICS AND LASER TECHNOLOGY
(2022)
Article
Nanoscience & Nanotechnology
Sarah N. Chowdhury, Piotr Nyga, Zhaxylyk A. Kudyshev, Esteban Garcia Bravo, Alexei S. Lagutchev, Alexander Kildishev, Vladimir M. Shalaev, Alexandra Boltasseva
Summary: Plasmonic color printing with semicontinuous metal films generates nonfading bright colors through optimization for a broad color range and increased stability. This environmentally friendly method utilizes various silver semicontinuous metal films deposited on a metallic mirror with a subwavelength-thick dielectric spacer, and extends the color gamut through femtosecond laser postprocessing. These structures can be applied to real-life artistic or technological applications with long-lasting colors and optimized overcoating dielectric layer.
Article
Optics
Tiancheng Zheng, Xueyang Li, Xianglong Cai, Chencheng Shen, Juntao Li, Jinbo Liu, Jingwei Guo
Summary: Random laser and stimulated Raman scattering were studied in poly (melamine formaldehyde) foam with micro/nano-sized porous structures using Rhodamine 6G ethanol solution. Differences in the behavior of RL and SRS were observed at different dye concentrations, with shorter cavity lengths and only SRS peaks observed in the compressed state.
JOURNAL OF LUMINESCENCE
(2021)
Article
Chemistry, Multidisciplinary
Arash Ahmadivand
Summary: This study reports on the near-ultraviolet light emission from enhanced tunneling of electrons using aluminum nanoelectrodes, which have high electron density and low screening capabilities compared to traditional noble metals. This breakthrough enables the generation of high-energy beams and accelerates the implementation of electrically tunable and ultradense UV light sources.
Article
Optics
Mandana Sadat Hosseini, Elnaz Yazdani, Elnaz Irani, Batoo Sajad, Fariba Mehradnia, Sirous Bazire, Amir Bayat
Summary: This study demonstrates the fabrication of a reproducible and stable mode random laser using Rhodamine 6G dye-containing ZnO@C-N microstructures. The coupling of stimulated Raman scattering effect and random lasing process plays a key role in enhancing the Raman peaks and achieving laser mode selection.
OPTICS COMMUNICATIONS
(2021)
Article
Optics
Qianliang Li, Walter Perrie, Zhaoqing Li, Stuart P. Edwardson, Geoff Dearden
Summary: By investigating the optical nonlinearity in polycrystalline zinc selenide (ZnSe) using femtosecond laser pulses, it was found that reverse saturated absorption (RSA) occurs during high intensity excitation in ZnSe. The two-photon absorption coefficient beta was found to be intensity dependent. Stimulated emission was observed when pumping a polycrystalline ZnSe sample within an optical cavity, indicating the possibility of reaching lasing threshold via two-photon pumping.
OPTO-ELECTRONIC ADVANCES
(2022)
Article
Optics
Shengtao Lin, Zinan Wang, Jiaqi Li, Siqi Chen, Yunjiang Rao, Gangding Peng, Anderson S. L. Gomes
Summary: This study reports for the first time significant wavelength down-conversion caused by FWM in a Ytterbium/Raman random fiber laser, as well as the simultaneous observation of nonlinear optical dynamics of SRS, FWM, and self-pulsation. The experimental results agree well with theoretical calculations for the FWM process, highlighting the importance of these findings for high power Raman-based fiber lasers and random fiber lasers.
OPTICS AND LASER TECHNOLOGY
(2021)
Article
Optics
Leidy Johana Quintero-Rodriguez, Ignacio Enrique Zaldivar-Huerta, Yanhua Hong, Cristina Masoller, Min Won Lee
Summary: The study compared the signals generated by two optical feedback setups and found that the signal from the stimulated Brillouin scattering optical feedback setup had slightly lower permutation entropy than the conventional optical feedback setup. However, in specific cases, the entropy of the conventional optical feedback signal was lower than that of the stimulated Brillouin scattering optical feedback signal.
Article
Nanoscience & Nanotechnology
Miguel Martinez-Calderon, Baptiste Groussin, Victoria Bjelland, Eric Chevallay, Valentin N. Fedosseev, Marcel Himmerlich, Pierre Lorenz, Alejandro Manjavacas, Bruce A. Marsh, Holger Neupert, Ralf E. Rossel, Walter Wuensch, Eduardo Granados
Summary: This research proposes the use of direct-laser nanostructuring techniques on copper substrates to improve the efficiency and robustness of electron photoinjectors. By exciting localized surface plasmons, hot electrons are generated, leading to a significant increase in quantum efficiency. When combined with semiconductor thin-films, the efficiency is further enhanced.
Article
Chemistry, Physical
Neha Verma, Anil Govindan, Pawan Kumar
Summary: Graphene is a promising material for terahertz radiation generation due to its unique properties, such as tunable surface plasmon resonance through doping. A scheme proposed to excite terahertz graphene plasmons at different frequencies on a graphene sheet involves nonlinear mixing of two laser beams. The amplitude of terahertz graphene surface plasmons decreases monotonically at higher frequencies due to weak coupling.
Article
Materials Science, Multidisciplinary
Shijia Cheng, Qing Chang, Zeng Wang, Lian Xiao, Elbert E. M. Chia, Handong Sun
Summary: This study demonstrates the fabrication of high crystalline and coverage CsPbBr3 thin films using a single-step physical technique - pulsed laser deposition (PLD), showing stimulated emission with low pump threshold at room temperature, providing insights for high performance all-inorganic CsPbBr3 perovskite films in various optoelectronic devices.
ADVANCED OPTICAL MATERIALS
(2021)
Article
Optics
Vasilios Karanikolas, Ioannis Thanopulos, Emmanuel Paspalakis
Summary: The population dynamics of a two-level quantum emitter (QE) near a hexagonal boron nitride (h-BN) layer were investigated in this study. It was found that the relaxation rate of the QE is significantly enhanced when resonant with the phonon-polariton bands of the h-BN layer, leading to reversible dynamics and potential formation of bound states. Such bound states in the continuum are crucial for designing practical future quantum applications.
Article
Physics, Applied
Adawiya J. J. Haider, Fatima I. I. Sultan, Mohammed J. J. Haider, Bakr Ahmed Taha, Sharafaldin Al-Musawi, Mahdi S. Edan, Chadeer S. S. Jassim, Norhana Arsad
Summary: This paper investigates the influence of two-shaped nanoparticles as scatter centers on the performance emission of a random laser. The optimal nanocomposite film concentrations were found to be 10(-4) M for R6G dye and 0:184 x 10(13) cm(-3) for ZnO NPs. The ZnO NW nanocomposite film exhibited a FWHM of 13nm at a threshold energy of 8.65mJ, while the ZnO NF nanocomposite film had a FWHM of 11nm and a threshold energy of 4.8mJ.
INTERNATIONAL JOURNAL OF MODERN PHYSICS B
(2023)
