scholarly journals Photoluminescence spectra of 1 MeV electron beam irradiated In0.53Ga0.47As/InP quantum well and bulk materials

2015 ◽  
Vol 64 (15) ◽  
pp. 154217
Author(s):  
Ma Li-Ya ◽  
Li Yu-Dong ◽  
Guo Qi ◽  
Ai Er-Ken ◽  
Wang Hai-Jiao ◽  
...  
Keyword(s):  
Electron Beam ◽  
Quantum Well ◽  
Photoluminescence Spectra ◽  
Bulk Materials

Photoluminescence Characterization of SiGe/Si Quantum-Well Wire Structures

1995 ◽  
Vol 379 ◽  
Author(s):  
S. Nilsson ◽  
H. P. Zeindl ◽  
A. Wolff ◽  
K. Pressel
Keyword(s):  
Quantum Well ◽  
Room Temperature ◽  
Molecular Beam ◽  
Optical Quality ◽  
Photoluminescence Spectra ◽  
Single Quantum Well ◽  
Quantum Well Wire ◽  
Carbon Interstitial

ABSTRACTLow-temperature photoluminescence measurements were performed in order to probe the optical quality of SiGe/Si quantum-well wire structures fabricated by electron-beam lithography and subsequent reactive ion etching, having the patterned polymethylmethacrylate resist as an etch mask. In addition, one set of quantum-well wire structures was post-treated by means of annealing in a hydrogen environment. Our results show that even for the smallest wires of about 100nm in width, the wires exhibit phonon-resolved photoluminescence spectra, similar to that from the molecular beam eptitaxially grown SiGe single quantum well which was used as starting material for the patterning process. After the patterning process a new sharp peak appears in the photoluminescence spectra at 0.97eV in photon energy. Our investigation suggests that this feature is introduced by damage during the patterning process and most probably identical to the G-line, which previously was identified as originating from the dicarbon centre (substitutional carbon-interstitial carbon) in Si. This centre is known to be a very common endproduct of irradiating Si near room temperature which is the case at our patterning process.

scholarly journals Large area deep ultraviolet light of Al0.47Ga0.53N/Al0.56Ga0.44N multi quantum well with carbon nanotube electron beam pumping

AIP Advances ◽  
2019 ◽  
Vol 9 (7) ◽  
pp. 075104 ◽  
Author(s):  
Sung Tae Yoo ◽  
Byeongchan So ◽  
Hye In Lee ◽  
Okhyun Nam ◽  
Kyu Chang Park
Keyword(s):  
Electron Beam ◽  
Carbon Nanotube ◽  
Quantum Well ◽  
Ultraviolet Light ◽  
Large Area ◽  
Deep Ultraviolet ◽  
Multi Quantum Well

scholarly journals Grating Metamaterials Based on CdTe/CdMgTe Quantum Wells as Terahertz Detectors for High Magnetic Field Applications

2020 ◽  
Vol 10 (8) ◽  
pp. 2807
Author(s):  
Dmitriy Yavorskiy ◽  
Maria Szoła ◽  
Krzysztof Karpierz ◽  
Rafał Bożek ◽  
Rafał Rudniewski ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Electron Beam ◽  
Quantum Well ◽  
Quantum Wells ◽  
Atomic Force Microscope ◽  
High Magnetic Field ◽  
White Light ◽  
Electron Beam Lithography ◽  
Terahertz Detectors ◽  
Atomic Force

The cyclotron and magnetoplasmon resonances were studied at 2 K in grating metamaterials fabricated on wafers with one or two modulation doped CdTe/CdMgTe quantum wells. The gratings (with the period varied between 2 μ m and 8 μ m) were prepared with an electron beam lithography either by etching or by evaporation of Au. The gratings were studied with an atomic force microscope which revealed a correlation between the depth and width of etched grooves at a constant time of etching. The sharpest resonances observed are due to excitation of magnetoplasmon in the case of Au gratings on a wafer with one quantum well. Etched samples with two quantum wells showed the strongest tuneability of magnetoplasmon resonances with the period of the grating and illumination with white light. We showed that the samples studied can be used as resonant or quasi-resonant terahertz detectors tuneable with magnetic field and white light.

Laser Spectroscopy of Materials Used in Paintings

1990 ◽  
Vol 185 ◽  
Author(s):  
Londa J. Larson ◽  
Kyeong-Sook Kim Shin ◽  
Jeffrey I. Zink
Keyword(s):  
Laser Spectroscopy ◽  
Excitation Wavelength ◽  
Photoluminescence Spectra ◽  
Bulk Materials ◽  
Drying Oils ◽  
Natural Resins ◽  
Materials Used

AbstractA wide variety of natural resins, waxes, gums, drying oils and proteinaceous materials used on paintings are photoluminescent. The photoluminescence spectra of these materials are reported and discussed. The application of this technique towards the identification of these materials is considered. Both bulk materials and films prepared from selected bulk materials were studied and a comparison is made between the bulk and film samples. Temperature and excitation wavelength studies are reported and discussed for several of the samples.

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