A tunable positive and negative photoconductive photodetector based on a gold/graphene/p-type silicon heterojunction

2019 ◽  
Vol 7 (4) ◽  
pp. 887-896 ◽  
Author(s):  
Peng-Fei Wang ◽  
Yu Liu ◽  
Jun Yin ◽  
Wanyun Ma ◽  
Zhanmin Dong ◽  
...  
Keyword(s):  
Laser Power ◽  
Incident Laser ◽  
Fast Switching ◽  
Type Silicon ◽  
Incident Laser Power ◽  
P Type ◽  
Power Densities

Fast switching of positive and negative photocurrents of a device under the modulation of different incident laser power densities.

Magnetoluminescence Studies in Ordered InGap2

1995 ◽  
Vol 417 ◽  
Author(s):  
E. D. Jones ◽  
R. P. Schneider ◽  
A. Mascarenhas
Keyword(s):  
Magnetic Field ◽  
Power Density ◽  
Laser Power ◽  
Laser Power Density ◽  
Band Spectrum ◽  
Incident Laser ◽  
Electron Hole ◽  
Incident Laser Power ◽  
Power Densities

AbstractPhotoluminescence measurements on ordered InGaP2 were studied as a function of temperature, laser power density, and magnetic field. The temperature varied between 1.4 and 300 K, the laser power densities ranged from 10 nW/cm2 to 20 W/cm2, and the maximum magnetic field was 13.6 T. The data show two spectra, excitonic and band-to-band transitions, depending upon the incident laser power density. A consistent interpretation of the band-to-band spectrum leads to a spatially separated electron-hole transitions between the ordered domains. Three different mechanisms for spatially indirect transitions are presented. An analysis of the linear data also allows a determination of the valence-band mass in the 100 direction of mv ∼0.25 m0.

scholarly journals Фотопреобразователь лазерного излучения на основе GaInP с КПД 46.7% на длине волны 600 nm

2022 ◽  
Vol 48 (5) ◽  
pp. 24
Author(s):  
С.А. Минтаиров ◽  
В.В. Евстропов ◽  
М.А. Минтаиров ◽  
М.В. Нахимович ◽  
Р.А. Салий ◽  
...  
Keyword(s):  
Laser Power ◽  
Incident Power ◽  
Incident Laser ◽  
Power Laser ◽  
Chip Design ◽  
Incident Laser Power ◽  
Level Data ◽  
Power Densities ◽  
Iv Curves ◽  
532 Nm

GaInP-based laser power converters (LPC) structure grown by MOVPE and device chip design have been optimized for operation under high-power lasers of the green-red spectral range. Light IV curves records have shown the performance of the LPC up to 40-50 W/cm2 of incident power densities. The highest level data were obtained for 532 nm, 600 nm, and 633 nm power laser lines: 44.3%, 46.7%, and 40.6% under 13-16 W/cm2, respectively. LPC demonstrated an efficiency of more than 40% at elevated up to 40-50 W/cm2 of the incident laser power density.

scholarly journals Neutral and Ionic Particle Emission From a GaAs Surface Induced by the (harmonic) Frequencies of the Nd:YAG Laser

1986 ◽  
Vol 6 (6) ◽  
pp. 349-359 ◽  
Author(s):  
G. R. Möhlmann ◽  
V. A. Kuzmin
Keyword(s):  
Nd:Yag Laser ◽  
Laser Power ◽  
Neutral Particle ◽  
Gaas Surface ◽  
Wave Form ◽  
Incident Laser ◽  
Neutral Particles ◽  
Incident Laser Power ◽  
Power Densities ◽  
Recorded Mass Spectrum

The emission of ionic and neutral particles, resulting from irradiation of a GaAs surface by 1064, 532, 355 and 266 nm Q-switched Nd:YAG laser light, has been studied. Incident laser power densities up to 9.6 × 107 Watts/cm2 have been applied. For 1064, 532 and 355 nm radiations the ratios of ionic to neutral particle emissions are close to the thermal ratio corresponding to the boiling point of Ga. In the case of 266 nm radiation this ratio appears to be higher, which is probably due to non-thermal ion contributions. For several incident wavelengths the emitted yields of ions and neutrals varied with the fifth power of the incident laser power density. The wave form of the emitted ion pulse and the recorded mass spectrum after irradiation at 266 nm differ significantly from those obtained at the other applied wavelengths.

scholarly journals Size dependent efficiency of photophoretic swimmers

2015 ◽  
Vol 184 ◽  
pp. 381-391 ◽  
Author(s):  
Andreas P. Bregulla ◽  
Frank Cichos
Keyword(s):  
Particle Size ◽  
Laser Power ◽  
Symmetry Axis ◽  
Particle Surface ◽  
Finite Size ◽  
Optical Power ◽  
Surface Flow ◽  
Incident Laser ◽  
Size Dependent ◽  
Incident Laser Power

We investigate experimentally the efficiency of self-propelled photophoretic swimmers based on metal-coated polymer particles of different sizes. The metal hemisphere absorbs the incident laser power and converts its energy into heat, which dissipates into the environment. A phoretic surface flow arises from the temperature gradient along the particle surface and drives the particle parallel to its symmetry axis. Scaling the particle size from micro to nanometers, the efficiency of converting optical power into motion is expected to rise with the reciprocal size for ideal swimmers. However, due to the finite size of the metal cap, the efficiency of a real swimmer reveals a maximum depending sensitively on the details of the metal cap shape. We compare the experimental results to numerical simulations.

A Novel Multibranched Chromophore Containing Carbazole Moiety for Two-Photon Microfabrication

2012 ◽  
Vol 485 ◽  
pp. 566-569
Author(s):  
Zhi Yuan Hu ◽  
Fu Quan Guo ◽  
Hao Liang ◽  
Bin Guo
Keyword(s):  
Cross Section ◽  
Laser Power ◽  
Photon Absorption ◽  
Structural Motif ◽  
Incident Laser ◽  
Two Photon Absorption ◽  
Two Photon ◽  
Incident Laser Power ◽  
Potential Applications ◽  
Pentaerythritol Triacrylate

A novel multibranched chromophore containing carbazole moiety，4, 4´, 4´´-tris(9-carbazyl-trans-styryl) triphenylamine (TCSTPA)，was synthesized and characterized by 1HNMR and elemental analysis. A larger two-photon absorption (TPA) cross section of the chromophore was obtained as high as 2350 GM compared to that of the traditional linear chromophore when pumped by a femtosecond laser at 800 nm. Microstructure based on TPA induced polymerization with a spatial resolution of submicron was fabricated under much lower incident laser power using TCSTPA as a TPA photoinitiator and a multifunctional resin of pentaerythritol triacrylate (PETA) as a polymerizable monomer. The result indicates potential applications of this kind of chromophores with multibranched structural motif in the fabrication of polymer and functional microdevices.

scholarly journals Photostability of Uranine via Crossed-Beam Thermal Lens Technique

2007 ◽  
Vol 2007 ◽  
pp. 1-5
Author(s):  
M. Zein El-Din ◽  
K. Elsayed ◽  
S. M. Al-Sherbini ◽  
M. A. Harith
Keyword(s):  
Thermal Lens ◽  
Laser Power ◽  
Modulation Frequency ◽  
Wavelength Modulation ◽  
Incident Laser ◽  
Diagnostic Aid ◽  
Sample Concentration ◽  
Incident Laser Power ◽  
Experimental Parameters ◽  
Photochemical Quantum Yield

Uranine is a diagnostic aid in ophthalmology and is used as an immunohistological stain. A photostability study on this important compound using a crossed-beam thermal lens (TL) technique was carried out. The study is based on the photodegradation (PD) behavior and rate regarding some experimental parameters such as the incident laser power, wavelength, modulation frequency, and sample concentration. The effects of such parameters on the TL signal and PD rate are discussed in details. It has been found that the PD rate is proportional to the power of the pumping laser and the concentration of the sample within the investigated range. However, the modulation frequency is found not to influence the PD rate. The photochemical quantum yield has been measured using potassium ferrioxalate actinometry and it was found to be very low.

Effect of incident laser power and incorporating polariton effects in GaN microrods

2019 ◽  
Vol 209 ◽  
pp. 328-332
Author(s):  
Poulami Ghosh ◽  
Dapeng Yu ◽  
Mingyuan Huang
Keyword(s):  
Laser Power ◽  
Incident Laser ◽  
Incident Laser Power

scholarly journals Plasmon-driven surface catalytic reaction of 4-ethynylaniline in a liquid environment

RSC Advances ◽  
2018 ◽  
Vol 8 (37) ◽  
pp. 20499-20504
Author(s):  
Yu Liu ◽  
Caiqing Ma ◽  
Yanqiu Yang ◽  
Yuanchun Zhao ◽  
Shiwei Wu ◽  
...  
Keyword(s):  
Exposure Time ◽  
Catalytic Reaction ◽  
Laser Power ◽  
Incident Laser ◽  
Interesting Phenomenon ◽  
Liquid Environment ◽  
Incident Laser Power ◽  
Raman Intensities

The mechanism of Ag NP induced dimerization of PEAN was investigated by using SERS spectra. A very interesting phenomenon was discovered, that is where the relative Raman intensities of b2 modes increased either with increasing incident laser power or exposure time.

scholarly journals Demonstration of temperature-plateau superheated liquid by photothermal conversion of plasmonic titanium nitride nanostructures

Nanoscale ◽  
2018 ◽  
Vol 10 (39) ◽  
pp. 18451-18456 ◽  
Author(s):  
Satoshi Ishii ◽  
Ryosuke Kamakura ◽  
Hiroyuki Sakamoto ◽  
Thang D. Dao ◽  
Satish L. Shinde ◽  
...  
Keyword(s):  
Titanium Nitride ◽  
Laser Power ◽  
Superheated Liquid ◽  
Liquid Temperature ◽  
Incident Laser ◽  
Photothermal Conversion ◽  
Incident Laser Power ◽  
Conductive Substrate ◽  
Temperature Plateau

When photothermally superheated liquid is on a high thermal conductive substrate, the liquid temperature stays constant for a certain range of incident laser power before bubbles are formed.

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