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The way electrons interact with photons of light is a key part of many modern technologies, from lasers to solar panels to LEDs. But the interaction is inherently a weak one because of a major mismatc...
Berkeley Lab researchers have developed a nano-sized optical antenna that can greatly enhance the spontaneous emission of light from atoms, molecules and semiconductor quantum dots. This advance opens...
Height structure of X-ray, EUV and white-light emission in a solar flare
Sun: fl ares – Sun: X-rays, gamma-rays – Sun: radio radiation – Sun: UV radiation – Acceleration of particles
2011/10/11
The bulk of solar flare emission originates from very compact sources located in the lower solar atmosphere and seen in various wavelength ranges: near optical, UV, EUV, soft and hard X-rays, and gamm...
An arrayed nanoantenna for broadband light emission and detection
optical nanoantennas subwavelength light guiding field enhancement unidirectional emission
2011/8/4
Abstract: We suggest a broadband optical unidirectional arrayed nanoantenna consisting of equally spaced nanorods of gradually varying length. Each nanorod can be driven by near-field quantum emitters...
Chaos-assisted directional light emission from microcavity lasers
light emission microcavity lasers
2010/4/6
We study the effect of dynamical tunneling on emission from ray-chaotic microcavities by introducing a suitably designed deformed disk cavity. We focus on its high quality factor modes strongly locali...
Light Emission from Rare-Earth Doped Silicon Nanostructures
Light Emission Rare-Earth Doped Silicon Nanostructures
2009/5/19
Rare earth (Tb or Ce)-doped silicon oxides were deposited by electron cyclotron resonance plasma-enhanced chemical vapour deposition (ECR-PECVD). Silicon nanocrystals (Si-ncs) were formed in the silic...
STM Light Emission Spectroscopy of Individual Quantum Wells: Measurement of Transport Parameters in Real Space
STM Light Emission Spectroscopy Individual Quantum Wells Transport Parameters Real Space
2010/10/21
By spectroscopically analyzing the light emitted from the tip-sample gap of the scanning tunneling microscope (STM), we have investigated the carrier transport as well as the luminescence properties o...
Single Mode Optical Radiation Distribution and Reflectivity Calculations in Novel-Hot Electron Light Emission and Lasing In Semiconductor Heterostructures VCSELs
Optical Radiation Distribution Electron Light Emission Reflectivity Calculations
2010/4/12
In this work, we calculate the power reflectivity in vertical cavity surface emitting lasers (VCSELs) using a new method. In VCSELs, the stop band of the reflectivity spectrum should exhibit a dip at ...
Filamentation of Light Emission in an Infrared-Visible Image Converter with a Semiconductor Photodetector
Light Emission Infrared-Visible Image Semiconductor Photodetector
2010/4/13
This work studies the light emission patterns associated with the spatial modulation of the transversal distribution of the current density in a converter cell with a GaAs semiconductor cathode. Such ...
Light Emission From Travelling Space Charge Domains
Light Emission Travelling Space Charge Domains
2010/4/16
We report light emission from n-doped GaAs epilayers associated with impact ionization when the device is biased in the negative difference resistance (NDR) regime (F > 3.5 kV cm-1). Spectral distribu...