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We experimentally investigate spatiotemporal lasing dynamics in semiconductor microcavities with various geometries, featuring integrable or chaotic ray dynamics. The classical ray dynamics directly impacts the lasing dynamics, which is primarily determined by the local directionality of long-lived ray trajectories. The directionality of optical propagation dictates the characteristic length scales of intensity variations, which play a pivotal role in nonlinear light-matter interactions. While wavelength-scale intensity variations tend to stabilize lasing dynamics, modulation on much longer scales causes spatial filamentation and irregular pulsation. Our results will pave the way to control the lasing dynamics by engineering the cavity geometry and ray dynamical properties.
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http://dx.doi.org/10.1103/PhysRevLett.131.153801 | DOI Listing |
ACS Sens
September 2025
Department of Biomedical Engineering, University of Michigan, Ann Arbor, Michigan 48109, United States.
We present a bioassay platform that leverages the lasing threshold distribution in a microlaser ensemble (ME), consisting of hundreds of individual microlasers, to measure analyte concentrations in solution. An ME is formed by placing dye-doped microbeads in a micro Fabry-Perot cavity. The microbeads are surface-modified with biorecognition molecules to capture analytes, while the quenchers resulting from the presence of the analytes on the microbeads' surfaces increase the lasing thresholds of the microlasers.
View Article and Find Full Text PDFSmall
September 2025
Faculty of Electronics, Telecommunications, and Informatics, Gdansk University of Technology, 11/12 G. Narutowicza Str., Gdansk, 80-233, Poland.
Two-dimensional black phosphorus (BP or phosphorene) has drawn significant interest in alkali metal ion storage due to its capacity to adsorb alkali atoms and high theoretical prediction of specific capacity. But the problem persists in large-scale production of the nanoscale BP, low electronic conductivity, considerable volume change (≈300%), and polyphosphide-induced shuttle effect. To solve this problem, a single-step lasing method is employed to prepare nanoscale BP covalently bound to the sp2 bonded carbon framework through a P─O─C/P─C bond.
View Article and Find Full Text PDFJ Phys Chem Lett
September 2025
State Key Laboratory of Ultra-intense Laser Science and Technology, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China.
Simultaneous detection of multiple reaction products induced by filamentation is crucial for unraveling complex atmospheric chemistry but remains challenging technically. Herein, we employ air-lasing-based coherent Raman spectroscopy to simultaneously monitor the formation and evolution of O and NO after femtosecond laser filamentation in synthetic air. Simultaneous detection of the two species reveals their distinct reaction dynamics.
View Article and Find Full Text PDFLight Sci Appl
August 2025
Department of Electrical Engineering and Computer Science, Research Laboratory of Electronics, Massachusetts Institute of Technology, Cambridge, 02139, MA, USA.
Dispersion engineering is critical for the creation of integrated broadband laser frequency combs. In the long wavelength infrared range (LWIR, 8-13 µm), frequency combs based on quantum cascade lasers are attractive since they are monolithic, fundamental oscillators with high power levels and efficiencies. One effective approach for expanding quantum cascade laser gain bandwidth is by stacking multiple gain media with different center lasing frequencies, as this leads to flatter broadband gain spectra.
View Article and Find Full Text PDFLight Sci Appl
August 2025
Ministry of Industry and Information Technology Key Lab of Micro-Nano Optoelectronic Information System, Guangdong Provincial Key Laboratory of Semiconductor Optoelectronic Materials and Intelligent Photonic Systems, Harbin Institute of Technology, Shenzhen, China.
Formation and dynamic control of strong coupling among cavities are essential to realize advanced functional photonic and quantum circuits. Especially for cavities at distant distance or arbitrary locations. Conventional approaches suffer from short coupling distance, poor controllability, fixed locations and low wavelength uniformity, significantly restricting the scalability of photonic and quantum networks.
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