Dependence of the saturable absorption of graphene upon excitation photon energy

2015 ◽  
Vol 106 (9) ◽  
pp. 091102 ◽  
Author(s):  
Fang Zhang ◽  
Shuo Han ◽  
Yanqing Liu ◽  
Zhengping Wang ◽  
Xinguang Xu
Keyword(s):  
Photon Energy ◽  
Saturable Absorption ◽  
Excitation Photon Energy

scholarly journals Excitation photon energy dependence of photo-induced phase transition in (EDO-TTF)2PF6

2009 ◽  
Vol 148 ◽  
pp. 012008 ◽  
Author(s):  
S Ogihara ◽  
K Onda ◽  
M Shimizu ◽  
T Ishikawa ◽  
Y Okimoto ◽  
...  
Keyword(s):  
Phase Transition ◽  
Energy Dependence ◽  
Photon Energy ◽  
Excitation Photon Energy

scholarly journals Intense sub-micrometre focusing of soft X-ray free-electron laser beyond 1016 W cm−2 with an ellipsoidal mirror

2019 ◽  
Vol 26 (5) ◽  
pp. 1406-1411 ◽  
Author(s):  
Hiroto Motoyama ◽  
Shigeki Owada ◽  
Gota Yamaguchi ◽  
Takehiro Kume ◽  
Satoru Egawa ◽  
...  
Keyword(s):  
Photon Energy ◽  
Free Electron ◽  
High Intensity ◽  
Free Electron Laser ◽  
Numerical Aperture ◽  
Saturable Absorption ◽  
X Ray ◽  
High Numerical Aperture ◽  
Ellipsoidal Mirror ◽  
Drastic Increase

Intense sub-micrometre focusing of a soft X-ray free-electron laser (FEL) was achieved by using an ellipsoidal mirror with a high numerical aperture. A hybrid focusing system in combination with a Kirkpatrick–Baez mirror was applied for compensation of a small spatial acceptance of the ellipsoidal mirror. With this system, the soft X-ray FEL pulses were focused down to 480 nm × 680 nm with an extremely high intensity of 8.8×1016 W cm−2 at a photon energy of 120 eV, which yielded saturable absorption at the L-edge of Si (99.8 eV) with a drastic increase of transmittance from 8% to 48%.

Silver photodiffusion into amorphous Ge chalcogenides

2020 ◽  
Vol 90 (3) ◽  
pp. 30101
Author(s):  
Yoshifumi Sakaguchi ◽  
Takayasu Hanashima ◽  
Al-Amin Ahmed Simon ◽  
Maria Mitkova
Keyword(s):  
Photon Energy ◽  
Scattering Length ◽  
Lone Pair ◽  
Neutron Reflectivity ◽  
Light Illumination ◽  
Light Emitting ◽  
Excitation Photon Energy ◽  
Visible Light Illumination ◽  
Amorphous Chalcogenides ◽  
Lone Pair Electrons

Silver photodiffusion into amorphous chalcogenides involves the movement of ions controlled by a UV-visible light illumination, and has potential application to memory devices. Understanding the kinetics of this phenomenon will expand the range of possible applications. Herein, we report the excitation photon energy dependence of the silver photodiffusion kinetics in Ag/amorphous Ge20S80/Si substrate stacks, probed by neutron reflectivity using four light-emitting diodes with different peak wavelengths. Time-dependent changes were clearly observed in all three of the Ag/Ag-doped reaction/chalcogenide host layers, in terms of layer thickness, scattering length density, and roughness. Silver photodiffusion effectively occurred when the excitation photon energy was greater than the optical gap of the chalcogenide host material. Excitation of lone-pair electrons to anti-bonding states at the chalcogenide layer therefore appears to play a crucial role in triggering silver photodiffusion.

Excitation Photon Energy Dependence of Photoluminescence in CdTe Thin Films

1999 ◽  
Vol 215 (1) ◽  
pp. 27-32
Author(s):  
M. C�rdenas-Garc�a ◽  
C. Mej�a-Garc�a ◽  
G. Contreras-Puente ◽  
J. Aguilar-Hern�ndez ◽  
J.L. L�pez-L�pez
Keyword(s):  
Thin Films ◽  
Energy Dependence ◽  
Photon Energy ◽  
Excitation Photon Energy ◽  
Cdte Thin Films

scholarly journals Hot electron transfer in Zn–Ag–In–Te nanocrystal–methyl viologen complexes enhanced with higher-energy photon excitation

RSC Advances ◽  
2020 ◽  
Vol 10 (28) ◽  
pp. 16361-16365 ◽  
Author(s):  
Tatsuya Kameyama ◽  
Kouta Sugiura ◽  
Susumu Kuwabata ◽  
Tomoki Okuhata ◽  
Naoto Tamai ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Photon Energy ◽  
Methyl Viologen ◽  
Hot Electron ◽  
Energy Photon ◽  
Excitation Photon Energy ◽  
Photon Excitation ◽  
Hot Electron Transfer

Zn–Ag–In–Te nanocrystals exhibited hot electron transfer to adsorbed methyl viologen, the efficiency being enhanced from 45% to 72% with an increase in the excitation photon energy.

Generation and Transport of Photocarriers in Head-Tail Poly(3-Alkylthiophene) Films

2001 ◽  
Vol 708 ◽  
Author(s):  
Koichi Rikitake ◽  
Wataru Takashima ◽  
Keiichi Kaneto
Keyword(s):  
Photon Energy ◽  
Optical Density ◽  
Schottky Junction ◽  
Excitation Spectra ◽  
Density Region ◽  
Excitation Photon Energy ◽  
Photovoltaic Effects

ABSTRACTPhotovoltaic effects in Schottky Junction cells composed with Au/head-tail poly(3-hexylthiophene) (HT-P3HT)/Al have been studied as a function of excitation photon energy and temperature. It has been found that photocarriers are effectively generated at the interface of HT-P3HT/Al from the excitation spectra of photocurrents (photoaction spectra), which were obtained upon illumination to the Au or Al sides. The photoaction spectra also suggest that the photocarrier generation occurs at around 2.3 eV and 3.5 eV, which correspond to the peak of φ-φ* absorption and the photon energy with lower optical density region, respectively. The mechanisms of photocarrier generation are discussed taking the role of the Schottky junction into consideration.

Sign in / Sign up

Export Citation Format

Share Document