Results 61 to 70 of about 2,028 (199)
High Voltage, EarlyView.ABSTRACT This study explores exciting state species and reaction pathways in positive leaders to better understand the breakdown mechanisms of long air gap discharges and natural lightning. Emission spectra from an unstable positive leader in a 1 m rod‐plate air gap under switching impulse voltages were observed, spanning 300–800 nm.
Hengxin He +6 more
wiley +1 more source
Light‐Activated Micromotors in Air Propelled by Thermal Convection
Advanced Materials, Volume 38, Issue 1, 2 January 2026.Near‐infrared‐driven micromotors in air can overcome gravity and generate convective motion by a light‐induced thermal mechanism driven by a temperature gradient in the air caused by the interaction of the gold nanoparticles present on the surface of ZnO and NIR irradiation.
Pedro Mena‐Giraldo +6 more
wiley +1 more source
Polarization insensitive resonance-domain blazed binary gratings
Optics Express, 2010 Three variants of binary blazed gratings with subwavelength features are considered, which have high first-order efficiencies in the non-paraxial domain for arbitrarily polarized light. A combination of effective medium theory and further parametric optimization with the Fourier modal method are used in design. Experimental demonstration is provided by
Heikki J, Hyvärinen +2 more
openaire +2 more sources
Advanced Materials Technologies, Volume 11, Issue 2, 22 January 2026.A low‐cost, maskless visible light photopatterning system has been developed by combining a consumer‐grade projector with a single Fresnel lens, generating the Fresnel Lens Integrated Projector (FLIP) system. FLIP enables flexible photopatterning of solid and gel films with features down to 30 µm and 135 µm, respectively.
Sridaran Rajagopal +2 more
wiley +1 more source
Control of femtosecond multi-filamentation in glass by designable patterned optical fields
AIP Advances, 2016 We present a scheme for realizing femtosecond multi-filamentation with designable quantity and locations of filaments, based on the control of multi-focal spots formed by patterned optical fields (POFs) composed of multiple individual optical fields ...
Ping-Ping Li +8 more
doaj +1 more source
Iridescence in Meat Caused by Surface Gratings
Foods, 2013 The photonic structure of cut muscle tissues reveals that the well-ordered gratings diffract light, producing iridescent colours. Cut fibrils protruding from the muscle surface create a two-dimensional periodic array, which diffract light at specific ...
Ali Kemal Yetisen +2 more
doaj +1 more source
Advanced Photonics Research, Volume 7, Issue 1, January 2026.Herein, the maximum violation of the three‐setting Clauser–Horne–Shimony–Holt (CHSH) inequality using nonmaximally entangled photons with orbital angular momentum is demonstrated. By mapping the optimization problem to maximizing a triangle's perimeter inscribed in an ellipse, the experiment validates the geometric approach and highlights the ...
Dongkai Zhang +2 more
wiley +1 more source
Crystals, 2017 Liquid crystal (LC) is a promising candidate for terahertz (THz) devices. Recently, LC has been introduced to generate THz vortex beams. However, the efficiency is intensely dependent on the incident wavelength, and the transformed THz vortex beam is ...
Shi-Jun Ge +7 more
doaj +1 more source
Chemically Driven Nano‐Elastic Heterogeneities Control Fragility in Volcanic Melts
Advanced Science, Volume 13, Issue 5, 27 January 2026.The study elucidates how nanoscale structural heterogeneity governs the mechanical behavior of volcanic glasses across compositions from basalt to rhyolite. Using a physicochemical framework, correlation length (ξ) and microscopic free volume (Vc) are derived from vibrational and physical properties, revealing systematic trends with silica content that
Michele Cassetta +13 more
wiley +1 more source
Waveguide couplers using parallelogramic-shaped blazed gratings
Optics Communications, 1994 Abstract A novel type of waveguide coupler with a parallelogramic-shaped grating is investigated. Analysis shows that this type of coupler provides a stronger radiation factor and higher coupling efficiency than conventional sawtooth grating couplers.
Li, M, Sheard, S
openaire +1 more source