scholarly journals Proximity Array Device: A Novel Photon Detector Working in Long Wavelengths

2020 ◽  
Vol 5 (2) ◽  
pp. 33 ◽  
Author(s):  
S. Javad Rezvani ◽  
Daniele Di Gioacchino ◽  
Claudio Gatti ◽  
Carlo Ligi ◽  
Mariangela Cestelli Guidi ◽  
...  
Keyword(s):  
Vortex Dynamics ◽  
Characteristic Frequency ◽  
Tunneling Current ◽  
High Sensitivity ◽  
Photon Detector ◽  
Quasi Particle ◽  
Long Wavelength ◽  
Metal State ◽  
Photo Response ◽  
Junction Array

We present here an innovative photon detector based on the proximity junction array device (PAD) working at long wavelengths. We show that the vortex dynamics in PAD undergoes a transition from a Mott insulator to a vortex metal state by application of an external magnetic field. The PAD also evidences a Josephson I-V characteristic with the external field dependent tunneling current. At high applied currents, we observe a dissipative regime in which the vortex dynamics is dominated by the quasi-particle contribution from the normal metal. The PAD has a relatively high photo-response even at frequencies below the expected characteristic frequency while, its superconducting properties such as the order parameter and the Josephson characteristic frequency can be modulated via external fields to widen the detection band. This device represents a promising and reliable candidate for new high-sensitivity long-wavelength detectors.

A Long-Wavelength Infrared Photoluminescence Spectrometer for the Characterization of Semiconductor Materials

1994 ◽  
Vol 299 ◽  
Author(s):  
R. P. Wright ◽  
S. E. Kohn ◽  
N. M. Haegel
Keyword(s):  
Infrared Detector ◽  
Optical Emission ◽  
High Sensitivity ◽  
Radiation Emission ◽  
Long Wavelength ◽  
Ion Laser ◽  
Detector Materials ◽  
Long Wavelength Infrared ◽  
Argon Ion

AbstractA new photoluminescence spectrometer has been developed for the characterization of optical emission in the 2.5 to 14.1 micron wavelength range. This instrument provides high sensitivity for the detection of interband and defect luminescence in a variety of infrared detector materials. The spectrometer utilizes a solid state photomultiplier detector and a circular variable filter, which serves as the resolving element. The entire spectrometer is cooled to 5K in order to decrease thermal radiation emission. Band-edge luminescence at 10.1 microns from HgCdTe samples has been readily detected with argon-ion laser excitation powers less than 70 mW/cm2. Representative spectra from HgCdTe and other infrared detector materials are presented.

scholarly journals Infrared optical properties of aged porous GaAs

2001 ◽  
Vol 16 (5) ◽  
pp. 1241-1244 ◽  
Author(s):  
S. Zangooie ◽  
M. Schubert ◽  
T. E. Tiwald ◽  
J. A. Woollam
Keyword(s):  
Optical Properties ◽  
High Sensitivity ◽  
Vibration Modes ◽  
Angle Of Incidence ◽  
Long Wavelength ◽  
Volume Porosity ◽  
Aging Properties ◽  
Solid Part ◽  
Porous Gaas ◽  
Infrared Optical Properties

Aging properties of porous GaAs were investigated nondestructively using variable angle of incidence infrared spectroscopic ellipsometry. In addition to the thickness and volume porosity, properties of the solid part of the porous material are investigated in terms of the long-wavelength dielectric function and chemical composition. The high sensitivity is employed to detect and identify infrared resonant absorptions related to different vibration modes of cubic and amorphous As2O3. Resonances centered at 333.3, 480, 785.8, 838, and 1045.5 cm−1 are from cubic As2O3, whereas resonances centered at 350, 490, and 808.5 cm−1 are from amorphous As2O3.

Chemically synthesized nanowire TiO2/ZnO core-shell p-n junction array for high sensitivity ultraviolet photodetector

2013 ◽  
Vol 103 (19) ◽  
pp. 193119 ◽  
Author(s):  
T. D. Dao ◽  
C. T. T. Dang ◽  
G. Han ◽  
C. V. Hoang ◽  
W. Yi ◽  
...  
Keyword(s):  
High Sensitivity ◽  
Core Shell ◽  
Ultraviolet Photodetector ◽  
Junction Array

scholarly journals Photodetection Characteristics of Gold Coated AFM Tips and n-Silicon Substrate nano-Schottky Interfaces

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Yawar Abbas ◽  
Ayman Rezk ◽  
Fatmah Alkindi ◽  
Irfan Saadat ◽  
Ammar Nayfeh ◽  
...  
Keyword(s):  
Low Cost ◽  
Tunneling Current ◽  
High Sensitivity ◽  
Complementary Metal Oxide Semiconductor ◽  
Cmos Technology ◽  
Oxide Semiconductor ◽  
Hot Electron ◽  
Semiconductor Interface ◽  
Afm Tips ◽  
Tip Radius

Abstract Silicon (Si)-based photodetectors are appealing candidates due to their low cost and compatibility with the complementary metal oxide semiconductor (CMOS) technology. The nanoscale devices based on Si can contribute efficiently in the field of photodetectors. In this report, we investigate the photodetection capability of nano-Schottky junctions using gold (Au) coated conductive atomic force microscope (C-AFM) tips, and highly cleaned n-Si substrate interface. The Au nanotip/n-Si interface forms the proposed structure of a nano Schottky diode based photodetector. The electrical characteristics measured at the nanoscale junction with different Au nanotip radii show that the tunneling current increases with decreasing the tip radius. Moreover, the tunneling process and photodetection effects are discussed in terms of barrier width/height decrease at the tip-semiconductor interface due to the applied electric field as well as the generation of plasmon-induced hot-electron at the nanoparticle (i.e. C-AFM tip)/n-Si interface. Furthermore, the photodetection sensitivity is investigated and it is found to be higher for C-AFM tips with smaller radii. Moreover, this research will open a new path for the miniaturization of photodetectors with high sensitivity based on nano-Schottky interfaces.

REPRODUCIBLE TUNNELING MEASUREMENTS IN CERAMIC Y1Ba2Cu3O7−x SAMPLES WITH DIFFERENT OXYGEN CONTENT

1991 ◽  
Vol 05 (11) ◽  
pp. 1899-1912 ◽  
Author(s):  
R. S. GONNELLI ◽  
G. F. DURIN ◽  
D. ANDREONE ◽  
V. LACQUANITI ◽  
C. APPINO ◽  
...  
Keyword(s):  
Experimental Data ◽  
Oxygen Content ◽  
Proximity Effect ◽  
Energy Gap ◽  
Point Contact ◽  
Tunneling Current ◽  
Sample Surface ◽  
Quasi Particle ◽  
Linear Behaviour ◽  
Particle Current

A large number of tunneling measurements on ceramic monophasic Y 1 Ba 2 Cu 3 O 7−x samples with different oxygen content using the point-contact geometry was performed. After a deconvolution procedure for removing the thermal broadening, experimental data were analyzed by means of a model of the total tunneling current which contains two terms: A background "normal" tunneling current and a quasi-particle tunneling one. The quasi-particle current was expressed in terms of the lifetime broadening model. The dependence of the energy gap Δ and of the lifetime broadening parameter Γ, as determined by the model, on the temperature of the sample is discussed. A linear behaviour in the dependence of the gap on the critical temperature of the sample has been found. The ratio 2Δ/kT c varies between 4.3 and 7.2 depending on the value of T c which can be attributed to the sample surface. The possible presence of proximity effect in our tunneling experiments is also discussed.

Real-Time Visualization and Monitoring of Physiological Dynamics by Aggregation-Induced Emission Luminogens (AIEgens)

2021 ◽  
Vol 14 (1) ◽  
pp. 413-435
Author(s):  
Xuewen He ◽  
Jacky W.Y. Lam ◽  
Ryan T.K. Kwok ◽  
Ben Zhong Tang
Keyword(s):  
Real Time ◽  
Near Infrared ◽  
Molecular Design ◽  
High Sensitivity ◽  
Microwave Emission ◽  
Excellent Performance ◽  
Disease Evolution ◽  
Aggregation Induced Emission ◽  
Long Wavelength ◽  
Real Time Visualization

Physiological dynamics in living cells and tissues are crucial for maintenance and regulation of their normal activities and functionalities. Tiny fluctuations in physiological microenvironments can leverage significant influences on cell growth, metabolism, differentiation, and apoptosis as well as disease evolution. Fluorescence imaging based on aggregation-induced emission luminogens (AIEgens) exhibits superior advantages in real-time sensing and monitoring of the physiological dynamics in living systems, including its unique properties such as high sensitivity and rapid response, flexible molecular design, and versatile nano- to mesostructural fabrication. The introduction of canonic AIEgens with long-wavelength, near-infrared, or microwave emission, persistent luminescence, and diversified excitation source (e.g., chemo- or bioluminescence) offers researchers a tool to evaluate the resulting molecules with excellent performance in response to subtle fluctuations in bioactivities with broader dimensionalities and deeper hierarchies.

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