We have observed spatial confinement of laser light in micrometer-sized random media. The optical is attributed to the disorder-induced scattering and interference. Our experimental data suggest that coherent amplification scattered enhances interference effect helps confinement. Using finite-difference time-domain method, we simulate lasing with feedback active medium.

A super‐amphiphobic polymeric coating , i.e., one that shows both water‐ and oil‐repellent properties, produced by a simple, one‐step casting process from two common polymers, is described. The micro–nano binary structure of the film has similarities to lotus leaf. Figure water droplet on surface, demonstrating contact angle (CA) 166 °C.

An intramolecular catalytic hairpin assembly is implemented on a DNA tetrahedron for mRNA imaging in living cells. The spatial confinement effect enables the acceleration of target-triggered signal generation, with excellent cell permeability and FRET stability.

We have fabricated microlasers with disordered semiconductor nanoparticles. The physical mechanism of optical confinement is based on Anderson localization light in micrometer-sized random media. Pulsed lasing occurs around 380 nm at room temperature under pumping.

Mechanical stresses applied to the plasma membrane of an adherent cell induces strain hardening cytoskeleton, <i>i.e.</i> elasticity cytoskeleton increases with its deformation. Strain is thought mediate transduction mechanical signals across through cytoskeleton. Here, we describe dependence a model system consisting actin filaments (F-actin), major component and F-actin cross-linking protein α-actinin, which localizes along contractile stress fibers at focal adhesions. We show that...

Filamentous actin (F-actin), one of the constituents cytoskeleton, is believed to be most important participant in motion and mechanical integrity eukaryotic cells. Traditionally, viscoelastic moduli F-actin networks have been measured by imposing a small strain quantifying resulting stress. The magnitude moduli, their concentration dependence dependence, as well nature (solid-like or liquid-like) uncross-linked F-actin, subjects debate. Although this paper helps resolve debate establishes...

In an active random medium, the combination of multiple scattering with light amplification may lead to laser action. However, it is crucial but sometimes difficult distinguish between amplified spontaneous emission and lasing. By varying amount in amplifying we have observed transition from lasing coherent feedback. We found out when occurs through measurement mean free path. Our numerical simulation based on direct solution Maxwell equations clearly illustrates oscillation due increase medium.

We have measured the photon statistics of random lasers with resonant feedback. With an increase pump intensity, number distribution in a single mode changes continuously from Bose-Einstein at threshold to Poisson well above threshold. The second-order correlation coefficient drops gradually 2 1. By comparing laser feedback and that nonresonant feedback, we illustrate very different lasing mechanisms for two types lasers.

The Hunga Tonga–Hunga Ha’apai (Tonga) injected only small amount of SO2 into the stratosphere, while our analyses Microwave Limb Sounder (MLS) measurements show that a massive water vapor was directly stratosphere by Tonga eruption, which is probably due to its submarine volcanic activity. eruption total 139 ± 8 Tg and resulted in an increase 8.9 0.5% global stratospheric vapor. Analyses also uppermost altitude impacted reached 1 hPa level (~47.6 km). Additionally, maximum hydration region...

We used smooth muscle α-actinin to evaluate the contribution of cross-linker dynamics mechanical properties actin filament networks. Recombinant actin-binding domain (residues 2–269) binds filaments with a <i>K</i>_d 1 μm at 25 °C, 20 times stronger than produced by thermolysin digestion native 25–257). Between 8 and °C rate constants for recombinant bind (0.8–2.7 μm⁻¹ s⁻¹) dissociate from (0.2–2.4 depend on temperature. At cross-linked are stiff nearly solid,...

We have achieved lasing in InAs quantum dot embedded GaAs microdisks under optical pumping. Above the threshold, a drastic increase of emission intensity is accompanied by decrease spectral linewidth whispering gallery modes. The laser light linearly polarized. polarization direction parallel to disk plane. wide gain spectrum dots allows simultaneous several modes microdisk.

All epithelial cells feature a prominent keratin intermediate filament (IF) network in their cytoplasm. Studies transgenic mice and patients with inherited fragility syndromes showed that major function of IFs is to provide mechanical support cell sheets. Yet the micromechanical properties themselves remain unknown. We used rheological methods assess suspensions epidermal type I II vimentin, III IF polymer. find both types form gels akin visco-elastic solids. With increasing deformation they...

We review our recent work on lasing in active random media. Light scattering, which had been regarded as detrimental to action for a long time, actually provided coherent feedback lasing. The fundamental difference and transition between laser with incoherent were illustrated. also trapped light micrometer-sized trapping was caused by disorder-induced scattering interference. This nontraditional way of confinement has important applications microlasers.

We report a systematic study of the linear rheology solutions model semiflexible polymers, actin filaments (F-actin), using mechanical rheometry, diffusing wave spectroscopy (DWS), and video-based single-particle tracking microrheology. For pure at c = 24 μM after full polymerization, elastic loss moduli still increase with time as G'(t) ∝ t0.25±0.02 G''(t) t0.15±0.03, when measured 1 rad/s, during network formation reach plateau 12 h. At equilibrium, small-frequency modulus has small...

We studied experimentally and theoretically the interaction of lasing modes in random media. When optical gain spectrum is inhomogeneously broadened, most repel each other frequency domain. Some are coupled through photon hopping or electron absorption reemission. Under pulsed pumping, weak coupling two leads to synchronization their action. Strong results antiphased oscillations intensities.

We experimentally investigate the dynamic response of random lasers using picosecond optical pumping. It is found that turn-on time a laser less than 100 ps. Above lasing threshold, emission pulse shortened dramatically. The dynamics each individual mode different. Lasing starts and gets to maximum value at different times. In addition, in modes lasts for periods time, frequency some also shifts with time. Relaxation oscillations are observed laser. theoretical simulations based on...

Abstract Owing to its important physiological functions, especially as molecular biomarkers of diseases, RNA is an focus biomedicine and biochemical sensing. Signal amplification detection has been put forward because the need for accurate identification at low expression levels, which significant early diagnosis therapy malignant diseases. However, conventional methods analysis depend on use enzymes, fixation cells, thermal cycling, confine their performance cell lysates or dead thus...

Ti and alloys are being widely used as bone tissue repair materials. Progress on mechanical properties bio-functionality is required for their applications due to the large difference in elastic modulus between implants fact that materials themselves biologically inert. In this work, a low-modulus, β-phase Ti-15Mo alloy based triply periodical minimal surfaces (TPMS) structure was fabricated using Powder Bed Fusion-Laser Beam (PBF-LB) under optimized printing parameters into implant samples...

The application of microtransfer technology to the manipulation process microdevices is an area current research. In context temperature-controlled technology, shape memory polymer (SMP) stamp plays a crucial role in microdevice manipulation, particularly surface adhesion. Aiming at problems such as complexity and high cost SMP microstructure preparation difficulty adhesion adjustment leading inflexibility pick release, this study investigated nanosecond ultraviolet (UV) laser ablation...