共查询到20条相似文献,搜索用时 31 毫秒
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In this paper, the optical effects on the characteristics of GaAs FinFET with Gaussian doping profile in the vertical direction of the channel considering quantum mechanical effects (QME) have been theoretically examined and analyzed. The device characteristics are obtained using self-consistent solution of 3D Poisson–Schrödinger equations using interpolating wavelet method and Simpson's one-third rule. This method provides more accurate results by dynamically adjusting the computational mesh and scales the CPU time linearly with the number of mesh points using polynomial interpolation, hence reducing the numerical cost. The results obtained are compared with uniformly doped Si FinFET photodetector characteristics and used to examine the performance of the device for its suitable use as a photodetector in Opto-Electronic Integrated Circuit (OEIC) receivers. 相似文献
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In this paper, the potential benefit of short channel triple material double gate (TM-DG) FinFET on the optical performance characteristics considering quantum mechanical effects has been theoretically examined and analyzed. The device characteristics are obtained from the self-consistent solution of 3D Poisson–Schrödinger equation using Leibmann's iteration method and provided the reasons for improved performance. The drain and transfer characteristics, electric field, transconductance and mobility of the device have been estimated and the results were compared with the device simulator results. The effect of different length ratios of three channel regions related to three different materials of TM-DG FinFET structure on the optical characteristics have also been discussed. The model is purely a physics based one and overcomes the major limitations of the existing 2D/3D analytical models by providing a more accurate result. The results obtained for dark and illuminated conditions are used to examine the performance of the device for its suitable use as a photodetector. 相似文献
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Nergis Mavalvala David E. McClelland Guido Mueller D. H. Reitze Roman Schnabel Benno Willke 《General Relativity and Gravitation》2011,43(2):569-592
Third generation terrestrial interferometric gravitational wave detectors will likely require significant advances in laser
and optical technologies to reduce two of the main limiting noise sources: thermal noise due to mirror coatings and quantum
noise arising from a combination of shot noise and radiation pressure noise. Increases in laser power and possible changes
of the operational wavelength require new high power laser sources and new electro-optic modulators and Faraday isolators.
Squeezed light can be used to further reduce the quantum noise while nano-structured optical components can be used to reduce
or eliminate mirror coating thermal noise as well as to implement all-reflective interferometer configurations to avoid thermal
effects in mirror substrates. This paper is intended to give an overview on the current state-of-the-art and future trends
in these areas of ongoing research and development. 相似文献
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In this paper we report a theoretical analysis of a long wavelength photoconductive detector for characterizing and optimizing
the device in respect of voltage responsivity, quantum efficiency, detectivity and noise equivalent power. The model has been
applied to examine the potential of an n-type Hg0.77Cd0.23Te photoconductive detector for possible application in free space optical communication system operating at the atmospheric
window near 9.6 μ m. In the present analysis we have taken into account all the major recombination mechanisms (e.g., Radiative,
Auger, and Shockley-Read-Hall types) including the effect of surface recombination at the interfaces that shape the characteristics
of photoconductor. The results obtained on the basis of our analysis reveal that in the absence of surface recombination the
device exhibits a peak quantum efficiency of 90%, a maximum detectivity of 108 MHz1/2/W at 77 K, a 3 dB bandwidth of 117.86 MHz and noise voltage of 5.4 × 10−6 V/Hz1/2. The sweep-out effect has been found to degrade the detectivity nearly by a factor of 10 at the same temperature and wavelength
of operation. The estimated noise equivalent power of the photodetector is of the order of 10−9 W at 9.6 μm wavelength. 相似文献
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William R. Johnson Simon J. Hook Pantazis Mouroulis Daniel W. Wilson Sarath D. Gunapala Cory J. Hill Jason M. Mumolo Bjorn T. Eng 《Infrared Physics & Technology》2009,52(6):430-433
A thermal hyperspectral imager is underdevelopment which utilizes the compact Dyson optical configuration and the broadband (8–12 μm) quantum well infrared photodetector (QWIP) focal plane array technology. The Dyson configuration uses a single monolithic prism-like grating design which allows for a high throughput instrument (F/1.6) with minimal ghosting, stray light and large swath width. The configuration has the potential to be the optimal high resolution imaging spectroscopy solution for aerial and space remote sensing applications due to its small form factor and relatively low power requirements. The planned instrument specifications are discussed as well as thermal design trade-offs. The current design uses a single high power cryocooler which allows operation of the QWIP at 40 K with adequate temperature stability.Calibration testing results (noise equivalent temperature difference, spectral linearity and spectral bandwidth) and laboratory emissivity plots from samples are shown using an operational testbed unit which has similar specifications as the final airborne system. Field testing of the testbed unit was performed to acquire plots of emissivity for various known standard minerals (quartz, opal, alunite). A comparison is made using data from the ASTER spectral library. The current single band (8–9 μm) testbed utilizes the high uniformity and operability of the QWIP array and shows excellent laboratory and field spectroscopic results. 相似文献
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S.D. Gunapala S.V. Bandara J.K. Liu J.M. Mumolo C.J. Hill S.B. Rafol D. Salazar J. Woolaway P.D. LeVan M.Z. Tidrow 《Infrared Physics & Technology》2007,50(2-3):217-226
Mid-wavelength infrared (MWIR) and long-wavelength infrared (LWIR) 1024 × 1024 pixel quantum well infrared photodetector (QWIP) focal planes have been demonstrated with excellent imaging performance. The MWIR QWIP detector array has demonstrated a noise equivalent differential temperature (NEΔT) of 17 mK at a 95 K operating temperature with f/2.5 optics at 300 K background and the LWIR detector array has demonstrated a NEΔT of 13 mK at a 70 K operating temperature with the same optical and background conditions as the MWIR detector array after the subtraction of system noise. Both MWIR and LWIR focal planes have shown background limited performance (BLIP) at 90 K and 70 K operating temperatures respectively, with similar optical and background conditions. In addition, we have demonstrated MWIR and LWIR pixel co-registered simultaneously readable dualband QWIP focal plane arrays. In this paper, we will discuss the performance in terms of quantum efficiency, NEΔT, uniformity, operability, and modulation transfer functions of the 1024 × 1024 pixel arrays and the progress of dualband QWIP focal plane array development work. 相似文献
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Armchair graphene nanoribbons (A-GNRs) are an alternative material to use in novel infrared photodetectors, because of their tunable energy gap in the infrared spectrum, and their high quantum efficiency. In this paper, an A-GNR p–i–n structure with all three structural families, different width, and different number of layers to use in IR detectors have been investigated. With calculating the band structure and energy gap using the tight-binding model and by including the edge deformation, the optical absorption in the single electron approximation has been obtained by calculating the optical conductance. Finally, we have calculated the quantum efficiency and the optical responsivity of A-GNR based IR photodetector as a function of incident photon energy, temperature, nanoribbon width and the number of layers. Results show that the responsivity of the A-GNR based IR photodetector increase by increasing the width and number of layers and decrease by increasing the temperature. 相似文献
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We analyze experimentally and theoretically mechanical oscillation within an optical cavity stimulated by the pressure of circulating optical radiation. The resulting radio frequency cavity vibrations (phonon mode) cause modulation of the incident, continuous-wave (cw) input pump beam. Furthermore, with increasing cw pump power, an evolution from sinusoidal modulation to random oscillations is observed in the pump power coupled from the resonator. The temporal evolution with pump power is studied, and agreement was found with theory. In addition to applications in quantum optomechanics, the present work suggests that radiation-pressure-induced effects can establish a practical limit for the miniaturization of optical silica microcavities. 相似文献
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The Squeezing and sub-poissonian photon statistics of an optical field are a purely quantum mechanical phenomenon and has
been accepted as means of achieving noise below the quantum shot-noise limit. The effect of higher-order squeezing and sub-poissonian
nature of an optical field in coherent anti-Stokes Raman scattering (CARS) and coherent anti-Stokes hyper Raman scattering
(CAHRS) are investigated under short-time approximation. The coupled Heisenberg equations of motion involving real and imaginary
parts of the quadrature operators are established and solved under short-time scale. The dependence of squeezing on the number
of photons is also investigated. It is also shown that higher-order squeezing allows a much larger fractional noise reduction
than lower-order squeezing. The occurrence of amplitude squeezing effects of the radiation field in the fundamental mode is
investigated in both the processes. The present work shows that squeezing is greater in CAHRS than the corresponding squeezing
in CARS. It is also shown that squeezing is greater in stimulated process than corresponding squeezing in spontaneous interaction.
The conditions for obtaining maximum and minimum squeezing are obtained. The photon statistics of the pump mode in the processes
has also been investigated and found to be sub-poissonian in nature. 相似文献
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半导体激光泵浦Nd:YVO4激光器的1.34μm输出特性 总被引:1,自引:0,他引:1
报道了半导体激光泵浦Nd:YVO4激光器在1.34μm的输出特性,当入射的泵浦光功率为515mW时,最大1.34μm激光输出功率达157mW,光-光转换效率为30.5%,研究了激光器的纵模特性及弛豫噪声与泵浦功率的关系,发现不同的纵模具有各自不同的弛豫振荡频率。 相似文献
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In this paper,we investigate the performance of the bulk fin field effect transistor(FinFET) through a threedimensional(3D) full band Monte Carlo simulator with quantum correction.Several scattering mechanisms,such as the acoustic and optical phonon scattering,the ionized impurity scattering,the impact ionization scattering and the surface roughness scattering are considered in our simulator.The effects of the substrate bias and the surface roughness scattering near the Si/SiO2 interface on the performance of bulk FinFET are mainly discussed in our work.Our results show that the on-current of bulk FinFET is sensitive to the surface roughness and that we can reduce the substrate leakage current by modulating the substrate bias voltage. 相似文献
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针对量子点光电探测器线列进行微光检测研究,量子点探测器采用AlAs/GaAs/AlAs双势垒结构,GaAs宽阱中分别有一个InAs量子点(QDs)和In0.15Ga0.85As量子阱(QW),建立一个简单的器件模型进行分析。常温下,在632.8 nm He-Ne激光照射下,当光功率为 0.01 pW时,器件偏压-0.5 V,积分时间80.2 μs,电压响应率达到7.0×1011 V·W-1,具有非常高的灵敏度,这种光电探测器在300 K温度下可以探测光功率小于10-14 W极弱光。以这种量子点光电探测器为核心研制的高灵敏度光谱仪和分子超光谱系统结合对生物组织样本进行检测,研制了一种图谱相互验证,互为校正的生物组织光谱测量系统。 相似文献
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We make an extensive investigation of linear, third-order nonlinear, and total optical absorption coefficients (ACs) of impurity doped quantum dots (QDs) in presence and absence of noise. The noise invoked in the present study is a Gaussian white noise. The quantum dot is doped with repulsive Gaussian impurity. Noise has been introduced to the system additively and multiplicatively. A perpendicular magnetic field acts as a source of confinement and a static external electric field has been applied. The AC profiles have been studied as a function of incident photon energy when several important parameters such as optical intensity, electric field strength, magnetic field strength, confinement energy, dopant location, relaxation time, Al concentration, dopant potential, and noise strength take on different values. In addition, the role of mode of application of noise (additive/multiplicative) on the AC profiles has also been analyzed meticulously. The AC profiles often consist of a number of interesting observations such as one photon resonance enhancement, shift of AC peak position, variation of AC peak intensity, and bleaching of AC peak. However, presence of noise alters the features of AC profiles and leads to some interesting manifestations. Multiplicative noise brings about more complexity in the AC profiles than its additive counterpart. The observations indeed illuminate several useful aspects in the study of linear and nonlinear optical properties of doped QD systems, specially in presence of noise. The findings are expected to be quite relevant from a technological perspective. 相似文献