Near Infrared Light Detectors Based on Uhvcvd Epitaxial Ge on Si (100)

1997 ◽  
Vol 486 ◽  
Author(s):  
L. Colace ◽  
G. Masini ◽  
F. Galluzzi ◽  
G. Assanto ◽  
G. Capellini ◽  
...  
Keyword(s):  
Near Infrared ◽  
Normal Incidence ◽  
Metal Structure ◽  
Atomic Scale ◽  
Infrared Light ◽  
Light Penetration ◽  
Silicon Chips ◽  
Metal Semiconductor Metal ◽  
Photo Detectors

AbstractIn the present work we investigate photo-detectors based on thick relaxed Ge layers, epitaxially grown on silicon after insertion of a low-temperature-grown Ge buffer layer. By using this procedure it was possible to grow films having thicknesses comparable with light penetration depth in the 1.3–1.6μm spectral range. The films exhibited flatness on the atomic scale. Two kinds of detectors were investigated: vertical heterojunction diodes and a planar Metal-Semiconductor-Metal structure. The detectors show a good responsivity at normal incidence at both 1.3 and 1.55μm. The photocurrent increases with the voltage applied, reaching a maximum responsivity of 0.24 A/W at 1.3μm under a bias of IV. A complete optoelectronic characterization of the fabricated devices is performed. The results confirm the feasibility of the proposed approach for the fabrication of 1.3–1.55μm near infrared photodetectors integrated on silicon chips.

scholarly journals Simulation and measurement of transcranial near infrared light penetration

2015 ◽  
Author(s):  
Lan Yue ◽  
Manuel Monge ◽  
Mehmet H. Ozgur ◽  
Kevin Murphy ◽  
Stan Louie ◽  
...  
Keyword(s):  
Near Infrared ◽  
Infrared Light ◽  
Light Penetration ◽  
Near Infrared Light

Evaluation of Optoelectronic Performance of Four Organic Photo Detectors Structures

2014 ◽  
Vol 945-949 ◽  
pp. 1991-1995
Author(s):  
Li Wang ◽  
Qun Feng Niu ◽  
Javier Soriano Camacho ◽  
Tao Dong
Keyword(s):  
Indium Tin Oxide ◽  
High Performance ◽  
Metal Structure ◽  
Semiconductor Layer ◽  
Interdigitated Electrodes ◽  
Organic Photoconductor ◽  
Sensing Applications ◽  
Metal Semiconductor Metal ◽  
Photo Detectors ◽  
Bottom To Top

Organic photosensor made of poly [N-9′′-heptadecanyl-2,7-carbazole-alt-5,5-(4′, 7′-di-2-thienyl-2′,1′,3′-benzothiadiazole)] (PCDTBT) are promising candidates for bio-sensing applications. This paper investigates the optoelectronic characteristics of 4 different structures through simulation, utilizing PCDTBT as the active absorption layer. The scheme 1 is formed by placing the PCDTBT layer on top of a SiO2layer, and then interdigitated electrodes made of aluminium are placed onto PCDTBT. As to the scheme 2, the semiconductor layer is placed between an aluminium layer (bottom) and glass (top) layer coated with thick transparent interdigitated electrodes made of indium tin oxide (ITO). Regarding to scheme 3, layers from bottom to top are SiO2, cathode, PCDTBT and anode. Cathode has the same area as SiO2and PCDTBT layers, but anode covers only partial of the semiconductor. Finally, in the scheme 4, the semiconductor layer is also placed over SiO2layer but here the anode and cathode are limiting the PCDTBT layer sides, having the same area for both sides. All schemes have same volume of semiconductor. The simulations have been realized in dark conditions and under light intensities 100 mW/cm2in the wavelength range of 400-550 nm. The best results were obtained for scheme 2, organic photoconductor with Metal-Semiconductor-Metal structure. For in this scheme which is under the conditions of 2 V bias, 500 nm wavelength and 100 mW/cm2illumination, the photocurrent, the internal and external quantum efficiency obtained were 8.53 μA, 88% and 45% respectively. As a conclusion, the scheme 2 Glass/PCDTBT/Aluminium with transparent electrodes has reached high performance desirable for bio-sensing.

scholarly journals Development of a Multimode Field Deployable Lidar Instrument for Topographic Measurements of Unsaturated Soil Properties: Instrument Description

2019 ◽  
Vol 11 (3) ◽  
pp. 289 ◽  
Author(s):  
Sean Salazar ◽  
Cyrus Garner ◽  
Richard Coffman
Keyword(s):  
Soil Properties ◽  
Near Infrared ◽  
Infrared Light ◽  
Differential Absorption ◽  
Matric Potential ◽  
Detection Scheme ◽  
Fines Content ◽  
Laser Absorption ◽  
Remote Sensor

The hydrological and mechanical behavior of soil is determined by the moisture content, soil water (matric) potential, fines content, and plasticity. However, these parameters are often difficult or impractical to determine in the field. Remote characterization of soil parameters is a non-destructive data collection process well suited to large or otherwise inaccessible areas. A ground-based, field-deployable remote sensor, called the soil observation laser absorption spectrometer (SOLAS), was developed to collect measurements from the surface of bare soils and to assess the in-situ condition and essential parameters of the soil. The SOLAS instrument transmits coherent light at two wavelengths using two, continuous-wave, near-infrared diode lasers and the instrument receives backscattered light through a co-axial 203-mm diameter telescope aperture. The received light is split into a hyperspectral sensing channel and a laser absorption spectrometry (LAS) channel via a multi-channel optical receiver. The hyperspectral channel detects light in the visible to shortwave infrared wavelengths, while the LAS channel filters and directs near-infrared light into a pair of photodetectors. Atmospheric water vapor is inferred using the differential absorption of the on- and off-line laser wavelengths (823.20 nm and 847.00 nm, respectively). Range measurement is determined using a frequency-modulated, self-chirped, coherent, homodyne detection scheme. The development of the instrument (transmitter, receiver, data acquisition components) is described herein. The potential for rapid characterization of physical and hydro-mechanical soil properties, including volumetric water content, matric potential, fines content, and plasticity, using the SOLAS remote sensor is discussed. The envisioned applications for the instrument include assessing soils on unstable slopes, such as wildfire burn sites, or stacked mine tailings. Through the combination of spectroradiometry, differential absorption, and range altimetry methodologies, the SOLAS instrument is a novel approach to ground-based remote sensing of the natural environment.

Non-invasive characterization of chick embryo body and cardiac movements using near infrared light

2019 ◽  
Vol 12 (1) ◽  
pp. 32-39 ◽  
Author(s):  
Alin Khaliduzzaman ◽  
Shinichi Fujitani ◽  
Naoshi Kondo ◽  
Yuichi Ogawa ◽  
Tateshi Fujiura ◽  
...  
Keyword(s):  
Chick Embryo ◽  
Near Infrared ◽  
Infrared Light ◽  
Near Infrared Light ◽  
Non Invasive
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