The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
First-principles calculations show that phonon-assisted Auger recombination and its interplay with the polarization fields in polar nitride LEDs play an important role in the efficiency-droop and green-gap problems of these devices.
355 nm generation was confirmed by using a novel ferroelectric QPM device, PP-LBGO with Fan-out structure as a third harmonic of 1064 nm light. More than 100 mW was generated without any walk-off.
Self-assembly approaches to construct plasmonic materials often result in high-symmetry structures within a thermodynamic limit. Here we demonstrate a novel selective self-assembly route for synthesis of a new class of nanoplasmonic structures with symmetry-breaking.
A planar layout for an ultra-compact plasmonic modulator is proposed and numerically investigated. Our device utilizes potentially CMOS compatible materials and can achieve 3-dB modulation in just 65nm and insertion loss <1dB at telecommunication wavelengths.
A spatial-spectral holographic channelizer and cueing receiver capable of operating 1–110 GHz with sub-MHz resolution, high dynamic range, and 1000 variably programmable channels is presented, along with initial test results in the 10–20 GHz band.
Precisely controlled blind via-holes were formed in multilayer substrates by an ultrafast laser. A LIBS detector integrated into the laser processing machine realizes the full potential of the ultrafast laser.
Chemical bonding, phase transitions, and surface processes occur on timescales comparable to the natural oscillation periods of atoms and molecules, in the range of femtoseconds (1 fs =10−15 s) to picoseconds (1 ps = 10−12 s). Advances in the generation of ultrashort laser pulses in the past two decades have made it possible to directly observe these fundamental processes. These advances have taken...
We report single-photon emission from electrically driven site-controlled InGaN/GaN dot-in-nanowires, fabricated from a planar single InGaN quantum well LED using a top-down approach. Each dot-in-nanowire's formation site, diameter, height and material compositions were precisely controlled.
We report on focus-optics free laser micro-processing of several materials using up to milli-joule energy-level fs-pulses directly delivered by 10m-long hypocycloid-core kagome HC-PCFs. The ablation rate and depth were studied showing high-precision drilling.
We report electrically driven light emission from a two-dimensional monolayer tungsten diselenide (WSe2). Our device is operated as a lateral p-n junction diode, formed by electrostatic doping.
We probe porous metal-organic framework materials (MOFs) using broadband terahertz (THz) pulses. Water molecules that are absorbed by the pores of the material display intermolecular dynamics differing from those of free water.
Nonlinear refractive dynamics of CS2 are measured with the beam deflection technique. A response function model is fit, from which the pulse width dependent n2,eff is calculated and compared to Z-scan measurements.
We design a novel core-shell nanocone structure that allows full absorption of sunlight in an iron oxide photoanode. The photocurrent approaches 12.5mA/cm2 within an iron oxide thickness of 20nm, verified by full-field electromagnetic simulation.
We give an overview of the application of ultra-short pulse (USP) lasers in the fabrication of miniaturized medical implants and devices like stents. Furthermore, we estimate the economic requirements to be fulfilled by USP lasers.
The development of new display technologies, such as organic LEDs and flexible displays, put stringent requirements in terms of manufacturing processes. We report on new results aiming at improving processing quality and yield.
We examine numerically and experimentally photonic band-gaps in liquid-like two dimensional photonic materials. Subwavelength dielectric rods and holes are randomly placed with Monte Carlo simulations, fabricated on silicon-on-insulator chips, and measured in near infrared wavelengths.
I will describe principles and advantages of the growth of semiconductor nanowires, specifically as applied to fabrication of light-emitting diodes for display and solid state lighting applications as well as for the realization of nanowire array solar cells.
We report certified quantum non-demolition measurement of atomic spins using criteria developed for continuous variable experiments in optics. We observe quantum state preparation and information-damage trade-off beyond classical limits by seven and twelve standard deviations.
The use of temporally shaped femtosecond laser pulses is shown to enable the control of ablation mechanisms in Sapphire ranging from gentle over strong ablation to explosive boiling.
A III-nitride-based Quantum Cascade detector grown by MOCVD is designed, fabricated and tested. Peak responsivity of 100 µA/W with detectivity of up to 108 Jones at ∼ 4 µm is measured.
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.