Results 61 to 70 of about 1,107 (175)

Designing Physical Unclonable Functions From Optically Active Materials

Advanced Materials, Volume 37, Issue 49, December 10, 2025.
Assigning unforgeable “fingerprints” to manufactured goods is a key strategy to fight global counterfeiting. Optical physical unclonable functions (PUFs) are chemically generated random patterns of optically active materials serving as unique authenticators.
Maxime Klausen, Junfang Zhang, Molly M. Stevens   +2 more
wiley   +1 more source

Chiral Metasurfaces with Multidimensional Tunability for Optical Chiral States

Advanced Optical Materials, Volume 13, Issue 36, December 19, 2025.
A novel bilayer perovskite chiral metasurface enables tunable transitions between BIC‐associated vortex centres and circularly polarized states via rotational symmetry control. Breaking rotational symmetry and applying in situ rotation to the upper layer allows precise, omnidirectional tuning of C points in momentum space. This evolution forms a Möbius‐
Dayang Lin, Abbas Ghaffari, Qing Gu
wiley   +1 more source

Silicone Shell‐Encapsulated Cholesteric Liquid Crystals and Their Colorimetric Characterization in HSV Color Space

Macromolecular Chemistry and Physics, Volume 226, Issue 24, December 19, 2025.
Cholesteric liquid crystal (ChLC) droplets are encapsulated with silicone shells by our novel two‐step dip coating procedure. The shells enable ChLCs to be embedded in hydrogels, leading to a reliable thermochromic sensor in aqueous environment. Digital image colorimetry in HSV color space are utilized to analyze the ordering of ChLCs.
Jueun Lee, Zhitong Lin, Hyun‐Joong Chung   +2 more
wiley   +1 more source

Equalization of pulse timings in an excitable microlaser system with delay

Physical Review Research, 2020
An excitable semiconductor micropillar laser with delayed optical feedback is able to regenerate pulses by the excitable response of the laser. It has been shown that almost any pulse sequence can, in principle, be excited and regenerated by this system ...
Soizic Terrien, Venkata A. Pammi, Neil G. R. Broderick, Rémy Braive, Grégoire Beaudoin, Isabelle Sagnes, Bernd Krauskopf, Sylvain Barbay   +7 more
doaj   +1 more source

Monolithic temperature‐insensitive high‐Q Ta2O5 microdisk resonator

Nanophotonics, Volume 14, Issue 27, Page 5475-5483, December 2025.
Abstract We demonstrate a temperature‐insensitive high‐Q tantalum oxide (Ta2O5) microdisk resonator fabricated using electron‐beam lithography and inductively coupled plasma reactive‐ion etching. The microdisks exhibit a loaded Q‐factor of 4.25 × 105 at 1,550 nm, which more than doubles (∼9.3 × 105) following thermal annealing at 600 °C.
Zhen Yang, Zheng Zhang, Peng Cheng, Zhe Long, Qi Cheng, Jiaqi Yang, Yu Lin, Bin Fang, Zhongming Zeng, Zhiping Zhou, Ganapathy Senthil Murugan, Rongping Wang   +11 more
wiley   +1 more source

Enhancing thermal stability of Nd:GGG WGM microdisk lasers via silica integration

Nanophotonics
Whispering gallery mode (WGM) resonators, as an integral component of integrated photonics, have attracted considerable attention due to their high Q factor, small footprint, and small mode volume, making them widely applied as microlasers. In this work,
Li Huiqi, Wang Zhaocong, Wang Lei, Tan Yang, Chen Feng   +4 more
doaj   +1 more source

Full-color laser displays based on organic printed microlaser arrays

Nature Communications, 2019
In the next generation of display technology for portable devices, lasers could replace LEDs to achieve more vibrant colours. Here, Zhao et al. demonstrate a dynamic full-color display in which each pixel is made up of three printed organic microlasers ...
Jinyang Zhao, Yongli Yan, Zhenhua Gao, Yuxiang Du, Haiyun Dong, Jiannian Yao, Yong Sheng Zhao   +6 more
doaj   +1 more source

Directional Lasing from a 3D Blue Phase Photonic Crystal

Advanced Optical Materials, Volume 13, Issue 33, November 25, 2025.
This work presents the first directional lasing from millimeter‐scale monocrystalline 3D photonic crystals, specifically Blue Phases (BPs), overcoming prior limitations of random lasing in polycrystals. These 3D soft photonic crystals enable highly directional, circularly polarized, mirrorless lasing via resonant polarization modes, offering the ...
Eva Oton, Marcin Muszyński, Konrad Cyprych, Piotr Kapuściński, Przemysław Morawiak, Maria Popławska, Przemysław Oliwa, Jarosław Myśliwiec, Jacek Szczytko, Wiktor Piecek   +9 more
wiley   +1 more source

Fractal modes and multi-beam generation from hybrid microlaser resonators

Nature Communications, 2018
Although fractal optical patterns have been realized previously, the direct generation of fractal modes from a laser has proven challenging. Here, Rivera et al.
José A. Rivera, Thomas C. Galvin, Austin W. Steinforth, J. Gary Eden   +3 more
doaj   +1 more source

Advances of Optofluidic Microcavities for Microlasers and Biosensors

Micromachines, 2018
Optofluidic microcavities with high Q factor have made rapid progress in recent years by using various micro-structures. On one hand, they are applied to microfluidic lasers with low excitation thresholds.
Zhiqing Feng, Lan Bai
doaj   +1 more source