The transmission spectra of sub-wavelength cross metallic fractal slits in terahertz (THz) frequency region are presented by means of finite-difference-time-domain (FDTD) simulation. The transmission spectra with multiple pass bands and stop bands are observed. To understand the physical mechanism of the enhanced transmissions, we simulated the electric field distribution of THz radiation within the metallic slits at the resonance frequencies by the electromagnetic design software named CONCERTO. Further analysis reveals that the two transmission peaks in the low frequency is the local resonance of electric field of the two cross slit, respectively. The third transmission peak is the co-effect of the two level cross slits. Our simulation is helpful for the understanding of THz wave propagation and THz transmission through the cross metallic fractal structures. It is also useful for the development of THz photonic devices.
{"title":"THz transmission through cross metallic fractal slits by FDTD simulation","authors":"Xiaoyan Wang, Liming Liu, Guozhong Zhao, Cunlin Zhang","doi":"10.1117/12.900492","DOIUrl":"https://doi.org/10.1117/12.900492","url":null,"abstract":"The transmission spectra of sub-wavelength cross metallic fractal slits in terahertz (THz) frequency region are presented by means of finite-difference-time-domain (FDTD) simulation. The transmission spectra with multiple pass bands and stop bands are observed. To understand the physical mechanism of the enhanced transmissions, we simulated the electric field distribution of THz radiation within the metallic slits at the resonance frequencies by the electromagnetic design software named CONCERTO. Further analysis reveals that the two transmission peaks in the low frequency is the local resonance of electric field of the two cross slit, respectively. The third transmission peak is the co-effect of the two level cross slits. Our simulation is helpful for the understanding of THz wave propagation and THz transmission through the cross metallic fractal structures. It is also useful for the development of THz photonic devices.","PeriodicalId":355017,"journal":{"name":"Photoelectronic Detection and Imaging","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-08-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126765620","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
J. Zhong, S. Shi, F. Pajot, Y. Atik, B. Belier, F. Gadot, S. Marnieros, M. Piat
We present a new design of an antenna-coupled superconducting transition-edge sensor (TES) bolometer. The incident radiation is coupled to a membrane-based twin-slot antenna and then transmitted through lossless microstrip lines to lossy meander-like microstrip lines in which a NbSi film is located between strip and dielectric layer. The NbSi film serves as both power absorber and temperature sensor (thermometer). With the help of the electromagnetic simulation software High Frequency Structure Simulator (HFSS), we have studied the performance of the twin-slot antenna. The simulation results for radiation pattern and return loss show promising prospects for this TES bolometer design. The power absorption in NbSi film is another important aspect which will be modeled in the future.
我们提出了一种天线耦合超导过渡边缘传感器(TES)辐射热计的新设计。将入射辐射耦合到基于膜的双槽天线，然后通过无损微带线传输到位于带层和介电层之间的NbSi薄膜的有损耗弯曲微带线。NbSi薄膜既可作为功率吸收器又可作为温度传感器(温度计)。借助电磁仿真软件High Frequency Structure Simulator (HFSS)，对双槽天线的性能进行了研究。辐射方向图和回波损耗的模拟结果表明，这种TES测热计设计具有良好的应用前景。NbSi薄膜的功率吸收是未来研究的另一个重要方面。
{"title":"Design and simulation of an antenna-coupled TES bolometer","authors":"J. Zhong, S. Shi, F. Pajot, Y. Atik, B. Belier, F. Gadot, S. Marnieros, M. Piat","doi":"10.1117/12.900818","DOIUrl":"https://doi.org/10.1117/12.900818","url":null,"abstract":"We present a new design of an antenna-coupled superconducting transition-edge sensor (TES) bolometer. The incident radiation is coupled to a membrane-based twin-slot antenna and then transmitted through lossless microstrip lines to lossy meander-like microstrip lines in which a NbSi film is located between strip and dielectric layer. The NbSi film serves as both power absorber and temperature sensor (thermometer). With the help of the electromagnetic simulation software High Frequency Structure Simulator (HFSS), we have studied the performance of the twin-slot antenna. The simulation results for radiation pattern and return loss show promising prospects for this TES bolometer design. The power absorption in NbSi film is another important aspect which will be modeled in the future.","PeriodicalId":355017,"journal":{"name":"Photoelectronic Detection and Imaging","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-08-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117164676","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
V. Trofimov, Svetlana A. Varentsova, N. Pałka, M. Szustakowski, T. Trzciński, S. Lan, Haiying Liu
The influence of an absolute phase of the THz pulse with a few cycles on the spectrum and spectral dynamics of signal reflected from or transmitted through the explosive or paper sheet is analyzed for problems of the detection and identification of explosive. The signal was measured on the long-term interval with duration about 180 ps and contains both the main reflected THz pulse and the subpulse with less intensity. Two cases of the reflection (normal and specular reflection) of the THz pulse from the RDX are considered. For the THz pulse interaction with the paper sheet the transmission mode is analyzed. Dependence of the nonlinear response of substance from the absolute phase of pulse is illustrated by examples of SHG or self-action of laser pulse with a few cycles. We showed that the absolute phase of pulse plays one of the key roles for the detection and identification of the substances at the reflection mode. It is necessary to investigate this problem with big attention during next few years.
{"title":"An influence of the absolute phase of THz pulse on linear and nonlinear medium response","authors":"V. Trofimov, Svetlana A. Varentsova, N. Pałka, M. Szustakowski, T. Trzciński, S. Lan, Haiying Liu","doi":"10.1117/12.903558","DOIUrl":"https://doi.org/10.1117/12.903558","url":null,"abstract":"The influence of an absolute phase of the THz pulse with a few cycles on the spectrum and spectral dynamics of signal reflected from or transmitted through the explosive or paper sheet is analyzed for problems of the detection and identification of explosive. The signal was measured on the long-term interval with duration about 180 ps and contains both the main reflected THz pulse and the subpulse with less intensity. Two cases of the reflection (normal and specular reflection) of the THz pulse from the RDX are considered. For the THz pulse interaction with the paper sheet the transmission mode is analyzed. Dependence of the nonlinear response of substance from the absolute phase of pulse is illustrated by examples of SHG or self-action of laser pulse with a few cycles. We showed that the absolute phase of pulse plays one of the key roles for the detection and identification of the substances at the reflection mode. It is necessary to investigate this problem with big attention during next few years.","PeriodicalId":355017,"journal":{"name":"Photoelectronic Detection and Imaging","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-08-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125158662","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Guang-qiang Wang, Jianguo Wang, Xue-feng Wang, Chang-jiang Tong, Xiaoze Li
Interaction between the high temperature (high-Tc) Josephson junctions and 0.14 THz nanosecond pulse has been numerically investigated in this paper. A general equivalent circuit based on resistively-shunted junction (RSJ) model was applied to simulate a typical high-Tc Josephson junction under the radiation of 0.14 THz narrow-band pulse with pulse duration of 2 ns. The varying ratio of phase difference of electron wave functions between the two sides of the junction, the current-voltage characteristics, and the voltage responses were determined at several specific times during the interaction. The Shapiro steps were clearly observed but distorted, and then the irradiation frequency was derived, coinciding with the simulated frequency. Also discussed were the effects of some parameters, including the pulse power, the normal resistance and the critical current of junction, on the current-voltage characteristics and the voltage responses. All the results showed that the high-Tc Josephson junctions probably could be used for the direct frequency measurements of narrow-band terahertz pulses under some specific conditions.
{"title":"Numerical research on the response of Josephson junction with 0.14 THz nanosecond pulse radiation","authors":"Guang-qiang Wang, Jianguo Wang, Xue-feng Wang, Chang-jiang Tong, Xiaoze Li","doi":"10.1117/12.900120","DOIUrl":"https://doi.org/10.1117/12.900120","url":null,"abstract":"Interaction between the high temperature (high-Tc) Josephson junctions and 0.14 THz nanosecond pulse has been numerically investigated in this paper. A general equivalent circuit based on resistively-shunted junction (RSJ) model was applied to simulate a typical high-Tc Josephson junction under the radiation of 0.14 THz narrow-band pulse with pulse duration of 2 ns. The varying ratio of phase difference of electron wave functions between the two sides of the junction, the current-voltage characteristics, and the voltage responses were determined at several specific times during the interaction. The Shapiro steps were clearly observed but distorted, and then the irradiation frequency was derived, coinciding with the simulated frequency. Also discussed were the effects of some parameters, including the pulse power, the normal resistance and the critical current of junction, on the current-voltage characteristics and the voltage responses. All the results showed that the high-Tc Josephson junctions probably could be used for the direct frequency measurements of narrow-band terahertz pulses under some specific conditions.","PeriodicalId":355017,"journal":{"name":"Photoelectronic Detection and Imaging","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-08-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122086271","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In this paper, ZnGeP2 (ZGP) crystal was pumped by a dual-band tunable CO2 laser. Based on the theory of nonlinear optical (NLO) frequency effect, a new THz light was generated. Under the conditions of three-frequency collinear nonlinear interaction and type-II phase matching (o+e→o), formulas of phase-matching angle, efficient nonlinear coefficient, the wave vector direction (θ, Φ), walk-off angle and acceptance angle were derived and relevant curves were analyzed with software. In this paper, the schematic diagram of THz generation based on ring cavity optical parametric oscillator (OPO) was designed. Theory analysis showed that the new ring cavity OPO was reasonable and efficient.
{"title":"The research of THz optical parametric oscillator based on ZnGeP2 crystal","authors":"B. Wang, Wei Hao","doi":"10.1117/12.900581","DOIUrl":"https://doi.org/10.1117/12.900581","url":null,"abstract":"In this paper, ZnGeP2 (ZGP) crystal was pumped by a dual-band tunable CO2 laser. Based on the theory of nonlinear optical (NLO) frequency effect, a new THz light was generated. Under the conditions of three-frequency collinear nonlinear interaction and type-II phase matching (o+e→o), formulas of phase-matching angle, efficient nonlinear coefficient, the wave vector direction (θ, Φ), walk-off angle and acceptance angle were derived and relevant curves were analyzed with software. In this paper, the schematic diagram of THz generation based on ring cavity optical parametric oscillator (OPO) was designed. Theory analysis showed that the new ring cavity OPO was reasonable and efficient.","PeriodicalId":355017,"journal":{"name":"Photoelectronic Detection and Imaging","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123751274","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Under the condition of photon limited, a photoelectric detection system with the capability of photon imaging has to be used when a faint target is needed to be imaged. Therefore, a photon imaging detection system (PIDS) has been constructed. When the system works, however, a part of noise is enhanced by the photon imaging head definitely while the signal is amplified. In this paper, two kinds of mathematical statistics methods are employed to analyze the comprehensive characteristics of noise in PIDS. One is probability distribution curve fitting and the other is Chi-square distribution hypothesis testing method. By applying these two methods, the analysis results of experiment data demonstrate that the comprehensive noise of PIDS subjects to the Poisson distribution, which is consistent with the theoretical analysis conclusion.
{"title":"Statistical analyses of noise in photon imaging detection system","authors":"Yu Huang, Xiao-fang Zhang, Xin Yu","doi":"10.1117/12.901631","DOIUrl":"https://doi.org/10.1117/12.901631","url":null,"abstract":"Under the condition of photon limited, a photoelectric detection system with the capability of photon imaging has to be used when a faint target is needed to be imaged. Therefore, a photon imaging detection system (PIDS) has been constructed. When the system works, however, a part of noise is enhanced by the photon imaging head definitely while the signal is amplified. In this paper, two kinds of mathematical statistics methods are employed to analyze the comprehensive characteristics of noise in PIDS. One is probability distribution curve fitting and the other is Chi-square distribution hypothesis testing method. By applying these two methods, the analysis results of experiment data demonstrate that the comprehensive noise of PIDS subjects to the Poisson distribution, which is consistent with the theoretical analysis conclusion.","PeriodicalId":355017,"journal":{"name":"Photoelectronic Detection and Imaging","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115407351","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Many factors affect space remote sensor imaging, causing image degradation of contrast and resolution decreasing, which cannot be solved neither by improving resolution of imaging components nor processing of images. In order to meet the imaging requirement of space remote sensor, image stabilization system should be included. In this paper, with a combining method of micro-mechanical and digital image stabilization, an image stabilization system based on DaVinci technology is designed, including imaging and sensing unit, operating and controlling unit and fast steering mirror unit, using TI TMS320DM6446 as the main processor of the image stabilization system, which performs the function of focal plane controlling, image acquisition, motion vector estimating, digital image stabilization operating, fast steering mirror controlling and image outputting. The workflow is as followings: first, through optical system, ground scene is imaged by imaging focal planes. Short exposure images acquired by imaging focal plane are transferred as series to the unit of computing and controlling. Then, inter-frame motion vector is computed from images according to gray projection algorithm, and employed as inputs with image series to do iterative back projection. In this way the final picture is obtained. Meanwhile, the control value obtained from the inter-frame motion vector is sent to the fast steering mirror unit, making compensation to damp vibrations. The results of experiments demonstrate that the image stabilization system improves the imaging performance of space remote sensor.
{"title":"Design of image stabilization system for space remote sensor based on DaVinci technology","authors":"Haoyang Li, Zhaojun Liu, Pengmei Xu","doi":"10.1117/12.901599","DOIUrl":"https://doi.org/10.1117/12.901599","url":null,"abstract":"Many factors affect space remote sensor imaging, causing image degradation of contrast and resolution decreasing, which cannot be solved neither by improving resolution of imaging components nor processing of images. In order to meet the imaging requirement of space remote sensor, image stabilization system should be included. In this paper, with a combining method of micro-mechanical and digital image stabilization, an image stabilization system based on DaVinci technology is designed, including imaging and sensing unit, operating and controlling unit and fast steering mirror unit, using TI TMS320DM6446 as the main processor of the image stabilization system, which performs the function of focal plane controlling, image acquisition, motion vector estimating, digital image stabilization operating, fast steering mirror controlling and image outputting. The workflow is as followings: first, through optical system, ground scene is imaged by imaging focal planes. Short exposure images acquired by imaging focal plane are transferred as series to the unit of computing and controlling. Then, inter-frame motion vector is computed from images according to gray projection algorithm, and employed as inputs with image series to do iterative back projection. In this way the final picture is obtained. Meanwhile, the control value obtained from the inter-frame motion vector is sent to the fast steering mirror unit, making compensation to damp vibrations. The results of experiments demonstrate that the image stabilization system improves the imaging performance of space remote sensor.","PeriodicalId":355017,"journal":{"name":"Photoelectronic Detection and Imaging","volume":"50 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124788330","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Crater detection and classification are critical elements for planetary mission preparations and landing site selection. This paper presents a methodology for the automated detection and matching of craters on images of planetary surface such as Moon, Mars and asteroids. For craters usually are bowl shaped depression, craters can be figured as circles or circular arc during landing phase. Based on the hypothesis that detected crater edges is related to craters in a template by translation, rotation and scaling, the proposed matching method use circles to fitting craters edge, and align circular arc edges from the image of the target body with circular features contained in a model. The approach includes edge detection, edge grouping, reference point detection and geometric circle model matching. Finally we simulate planetary surface to test the reasonableness and effectiveness of the proposed method.
{"title":"Automated detection and classification for craters based on geometric matching","authors":"Jian-qing Chen, P. Cui, H. Cui","doi":"10.1117/12.901020","DOIUrl":"https://doi.org/10.1117/12.901020","url":null,"abstract":"Crater detection and classification are critical elements for planetary mission preparations and landing site selection. This paper presents a methodology for the automated detection and matching of craters on images of planetary surface such as Moon, Mars and asteroids. For craters usually are bowl shaped depression, craters can be figured as circles or circular arc during landing phase. Based on the hypothesis that detected crater edges is related to craters in a template by translation, rotation and scaling, the proposed matching method use circles to fitting craters edge, and align circular arc edges from the image of the target body with circular features contained in a model. The approach includes edge detection, edge grouping, reference point detection and geometric circle model matching. Finally we simulate planetary surface to test the reasonableness and effectiveness of the proposed method.","PeriodicalId":355017,"journal":{"name":"Photoelectronic Detection and Imaging","volume":"538 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123245959","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In order to unite the merits of ICCD (intensified charge coupled device) and EMCCD (electron multiplying charge coupled device) for detection of the weak signal in the high resolution Thomson scattering system from strong radiation background, a second generation image intensifier, lens coupled with an EMCCD are used together as a detector. The signal photon flux is so low in the actual measurement situation that the gain of the I.I., on-chip multiplication gain of EMCCD and on-chip binning scheme might all need to be utilized to enhance the detection capability or to set lower demands for other devices. At the same time, however, these amplification processes bring unexpected noise in addition to the detector noise itself, which will further degrade the signal to noise ratio (SNR). This paper will focus on three points. Firstly, the three gain methods, including MCP gain, EM gain and binning are theoretically described. Secondly, the amount of increase in signal counts based on this detector combination is experimentally investigated at various gain settings, as well as the total noise. Finally, a gain selection disciplines aiming to obtain an optimum SNR is generalized according to the comparison between test results and theory.
{"title":"Gain and noise analysis of an intensified EMCCD","authors":"Xiaoqi Xi, Junyu Zhao, Qing Zang, Xiaofeng Han, X. Dai, Jianhua Yang, Lili Zhang, Mengting Li","doi":"10.1117/12.900801","DOIUrl":"https://doi.org/10.1117/12.900801","url":null,"abstract":"In order to unite the merits of ICCD (intensified charge coupled device) and EMCCD (electron multiplying charge coupled device) for detection of the weak signal in the high resolution Thomson scattering system from strong radiation background, a second generation image intensifier, lens coupled with an EMCCD are used together as a detector. The signal photon flux is so low in the actual measurement situation that the gain of the I.I., on-chip multiplication gain of EMCCD and on-chip binning scheme might all need to be utilized to enhance the detection capability or to set lower demands for other devices. At the same time, however, these amplification processes bring unexpected noise in addition to the detector noise itself, which will further degrade the signal to noise ratio (SNR). This paper will focus on three points. Firstly, the three gain methods, including MCP gain, EM gain and binning are theoretically described. Secondly, the amount of increase in signal counts based on this detector combination is experimentally investigated at various gain settings, as well as the total noise. Finally, a gain selection disciplines aiming to obtain an optimum SNR is generalized according to the comparison between test results and theory.","PeriodicalId":355017,"journal":{"name":"Photoelectronic Detection and Imaging","volume":"175 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123391791","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
F. Su, G. Sharma, F. Blanchard, L. Razzari, A. Ayesheshim, R. Morandotti, T. Ozaki, F. Hegmann
The transient absorption bleaching and velocity overshoot of photoexcited carriers in GaAs and Si have been observed by the intense few-circle terahertz (THz) probe pulse in the optical pump-terahertz probe (OPTP) configuration. The free-carrier THz nonlinearity is attributed to the transient electron redistribution in conduction band induced by the strong THz electric field component.
{"title":"Nonlinear free-carrier velocity induced by intense terahertz pulse in photoexcited semiconductor materials","authors":"F. Su, G. Sharma, F. Blanchard, L. Razzari, A. Ayesheshim, R. Morandotti, T. Ozaki, F. Hegmann","doi":"10.1117/12.900526","DOIUrl":"https://doi.org/10.1117/12.900526","url":null,"abstract":"The transient absorption bleaching and velocity overshoot of photoexcited carriers in GaAs and Si have been observed by the intense few-circle terahertz (THz) probe pulse in the optical pump-terahertz probe (OPTP) configuration. The free-carrier THz nonlinearity is attributed to the transient electron redistribution in conduction band induced by the strong THz electric field component.","PeriodicalId":355017,"journal":{"name":"Photoelectronic Detection and Imaging","volume":"27 3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123553580","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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