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Far-infrared spectra of imperfect YBaCuO films on Si substrates Si衬底上不完全YBaCuO薄膜的远红外光谱
Infrared physics Pub Date : 1993-06-01 DOI: 10.1016/0020-0891(93)90014-X
P. Berberich , M. Chiusuri , S. Cunsolo , P. Dore , H. kinder , C.P. Varsamis
{"title":"Far-infrared spectra of imperfect YBaCuO films on Si substrates","authors":"P. Berberich ,&nbsp;M. Chiusuri ,&nbsp;S. Cunsolo ,&nbsp;P. Dore ,&nbsp;H. kinder ,&nbsp;C.P. Varsamis","doi":"10.1016/0020-0891(93)90014-X","DOIUrl":"10.1016/0020-0891(93)90014-X","url":null,"abstract":"<div><p>We have measured the far-infrared (FIR) transmittance of low conductivity, imperfect YBCO films deposited on Si, at both 300 K and 20 K. Test reflectance measurements were also performed at room temperature. Our aim was both to study YBCO phonons by transmission measurements and to check if FIR spectra of imperfect YBCO films can be described in the framework of the BCS theory. In order to describe our measurements, we provide exact expressions for both transmittance and reflectance, averaged with respect to the interference fringes of the substrate. By modelling the complex dielectric constant of the film, we then study the YBCO phonons which are evident in the measured spectra. The comparison between spectra of normal and superconducting phases shows that the superconducting transition affects our spectra only at very low frequencies. By considering a two fluid model in which only a small fraction of electrons becomes superconducting and by assuming an energy gap of the order of 130 cm<sup>−1</sup>, we find that our data can be explained in terms of the Mattis-Bardeen theory.</p></div>","PeriodicalId":81524,"journal":{"name":"Infrared physics","volume":"34 3","pages":"Pages 269-279"},"PeriodicalIF":0.0,"publicationDate":"1993-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0020-0891(93)90014-X","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"53081828","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}
引用次数: 16
Non-destructive characterization of dual epilayer silicon structures 双涂层硅结构的无损表征
Infrared physics Pub Date : 1993-06-01 DOI: 10.1016/0020-0891(93)90018-3
J.A.A. Engelbrecht , M. Walden, A. Dupnock
{"title":"Non-destructive characterization of dual epilayer silicon structures","authors":"J.A.A. Engelbrecht ,&nbsp;M. Walden,&nbsp;A. Dupnock","doi":"10.1016/0020-0891(93)90018-3","DOIUrl":"10.1016/0020-0891(93)90018-3","url":null,"abstract":"<div><p>Dual epilayer structures consisting of <span><math><mtext>p−</mtext><mtext>p+</mtext></math></span> on p− silicon substrates were characterized using non-destructive Fourier transform infrared reflectance spectroscopy and sheet resistance measurements. The thickness of each layer, as well as the dopant concentration of the layers were determined. Results were compared to data obtained by spreading resistance profiling.</p></div>","PeriodicalId":81524,"journal":{"name":"Infrared physics","volume":"34 3","pages":"Pages 303-309"},"PeriodicalIF":0.0,"publicationDate":"1993-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0020-0891(93)90018-3","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"53081465","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}
引用次数: 0
Magneto-optical effects in ferrofluids at near millimetre wavelengths 近毫米波长铁磁流体中的磁光效应
Infrared physics Pub Date : 1993-06-01 DOI: 10.1016/0020-0891(93)90017-2
J.R. Birch , C.A. Bentley , J.P. Llewellyn
{"title":"Magneto-optical effects in ferrofluids at near millimetre wavelengths","authors":"J.R. Birch ,&nbsp;C.A. Bentley ,&nbsp;J.P. Llewellyn","doi":"10.1016/0020-0891(93)90017-2","DOIUrl":"10.1016/0020-0891(93)90017-2","url":null,"abstract":"<div><p>The results of experiments aimed at establishing the origin of near millimetre wavelength magneto-optical effects observed in various ferrofluids are presented and discussed. These microscopic effects are probed at the macroscopic level by using an a.c. magnetic field to impose polarization modulation on near millimetre wave radiation propagating through such fluids. The results indicate that the basic mechanism is Néel rotation of the magnetic moment within each component magnetic particle of the fluids.</p></div>","PeriodicalId":81524,"journal":{"name":"Infrared physics","volume":"34 3","pages":"Pages 299-302"},"PeriodicalIF":0.0,"publicationDate":"1993-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0020-0891(93)90017-2","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"53081454","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}
引用次数: 0
Preparation and measurement of LiTaO3 type II pyroelectric detectors LiTaO3型热释电探测器的制备与测量
Infrared physics Pub Date : 1993-06-01 DOI: 10.1016/0020-0891(93)90020-8
Xu-Sheng Wang, Jin-Xiu Gao, Shi-Dong Cai, Hian-Qi Zhang
{"title":"Preparation and measurement of LiTaO3 type II pyroelectric detectors","authors":"Xu-Sheng Wang,&nbsp;Jin-Xiu Gao,&nbsp;Shi-Dong Cai,&nbsp;Hian-Qi Zhang","doi":"10.1016/0020-0891(93)90020-8","DOIUrl":"10.1016/0020-0891(93)90020-8","url":null,"abstract":"<div><p>LiTaO<sub>3</sub> type II pyroelectric detectors have been prepared and measured. The responsivity <em>Rv</em>(500 K, 10 Hz) = 110 V/W; detectivity <em>D</em>∗ (500 K, 10 Hz) = 6.15 × 10<sup>6</sup> cmHz<span><math><mtext>1</mtext><mtext>2</mtext></math></span>/W. The mechanism of the detectors is discussed.</p></div>","PeriodicalId":81524,"journal":{"name":"Infrared physics","volume":"34 3","pages":"Pages 323-325"},"PeriodicalIF":0.0,"publicationDate":"1993-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0020-0891(93)90020-8","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"53081479","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}
引用次数: 0
A comparison between electron mobilities in Hg1−xMnxTe and Hg1−xCdxTe Hg1−xMnxTe和Hg1−xCdxTe中电子迁移率的比较
Infrared physics Pub Date : 1993-06-01 DOI: 10.1016/0020-0891(93)90019-4
Wafaa A. Gobba , J.D. Patterson , S.L. Lehoczky
{"title":"A comparison between electron mobilities in Hg1−xMnxTe and Hg1−xCdxTe","authors":"Wafaa A. Gobba ,&nbsp;J.D. Patterson ,&nbsp;S.L. Lehoczky","doi":"10.1016/0020-0891(93)90019-4","DOIUrl":"10.1016/0020-0891(93)90019-4","url":null,"abstract":"<div><p>Electron mobility in the n-type diluted magnetic semiconductor Hg<sub>1−<em>x</em></sub>Mn<sub><em>x</em></sub>Te has been calculated in the absence of a magnetic field. The results were compared to those of Hg<sub>1−<em>x</em></sub>Cd<sub><em>x</em></sub>Te for the same range of energy gap. The calculations are based on solving the Boltzmann equation using a variational principle technique. The scattering processes that are included in the calculations are the scattering of the electrons with ionized impurities, holes, alloy disorder, acoustic phonons and longitudinal optical phonons. At room temperatures the mobilities are nearly the same, while at temperatures of the order of liquid nitrogen they are about 30% less for MMT as compared with the same concentration of defects.</p></div>","PeriodicalId":81524,"journal":{"name":"Infrared physics","volume":"34 3","pages":"Pages 311-321"},"PeriodicalIF":0.0,"publicationDate":"1993-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0020-0891(93)90019-4","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"53081472","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}
引用次数: 4
New phenomena related to pulsed far-infrared superradiant and Raman emissions 与脉冲远红外超辐射和拉曼辐射有关的新现象
Infrared physics Pub Date : 1993-06-01 DOI: 10.1016/0020-0891(93)90013-W
D.P. Scherrer, F.K. Kneubühl
{"title":"New phenomena related to pulsed far-infrared superradiant and Raman emissions","authors":"D.P. Scherrer,&nbsp;F.K. Kneubühl","doi":"10.1016/0020-0891(93)90013-W","DOIUrl":"10.1016/0020-0891(93)90013-W","url":null,"abstract":"<div><p>We report on new effects in relation to optical pumping of far-infrared (FIR) superradiance and Raman emissions in CH<sub>3</sub>F, CH<sub>3</sub>CN, D<sub>2</sub>O, NH<sub>3</sub> by rapidly truncated 10 μm CO<sub>2</sub> laser pulses and optical-free-induction decay (OFID) 30 ps-10μm-CO<sub>2</sub> laser pulses. Thus, we have found a drastic reduction of the FIR-pulse duration which is closely related to the fast truncation of about 10 ps of the plasma shutter used in our OFID 10 μm-CO<sub>2</sub> laser system. The forward emissions exhibit the on-set of swept-gain superradiance and the appearance of Raman emission with increasing pressure in the FIR cell. This implies line competition between the superradiant and Raman emissions and thus results in different emission regimes which we have investigated systematically. The backward emissions are superradiant over the whole range of our investigations and show high quality with respect to stability and reproducibility which is important for applications.</p><p>Furthermore, we have found that the CO<sub>2</sub>-pump radiation and the generated FIR Raman emission interact mutually which results in anticorrelated fluctuations of the two fields. We have been able to interpret this effect as a result of periodic back-and-forth fluctuations of the Λ-like three-level molecular systems.</p><p>Finally, we have observed the development of OFID of the truncated CO<sub>2</sub>-pump pulses in the FIR-laser gases. This effect has been thoroughly investigated and as a result we have generated for the first time ps-10 μm-CO<sub>2</sub>-OFID pulses with FIR-laser gases as spectral filters instead of the usual hot CO<sub>2</sub> gas. New phenomena and advantages of our new OFID system based on FIR laser gases are discussed.</p></div>","PeriodicalId":81524,"journal":{"name":"Infrared physics","volume":"34 3","pages":"Pages 227-267"},"PeriodicalIF":0.0,"publicationDate":"1993-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0020-0891(93)90013-W","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"53081808","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}
引用次数: 25
Forthcoming conferences 即将到来的会议
Infrared physics Pub Date : 1993-06-01 DOI: 10.1016/0020-0891(93)90024-2
{"title":"Forthcoming conferences","authors":"","doi":"10.1016/0020-0891(93)90024-2","DOIUrl":"https://doi.org/10.1016/0020-0891(93)90024-2","url":null,"abstract":"","PeriodicalId":81524,"journal":{"name":"Infrared physics","volume":"34 3","pages":"Page 338"},"PeriodicalIF":0.0,"publicationDate":"1993-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0020-0891(93)90024-2","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136888543","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Corrigenda 更正
Infrared physics Pub Date : 1993-06-01 DOI: 10.1016/0020-0891(93)90023-Z
{"title":"Corrigenda","authors":"","doi":"10.1016/0020-0891(93)90023-Z","DOIUrl":"https://doi.org/10.1016/0020-0891(93)90023-Z","url":null,"abstract":"","PeriodicalId":81524,"journal":{"name":"Infrared physics","volume":"34 3","pages":"Page 337"},"PeriodicalIF":0.0,"publicationDate":"1993-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0020-0891(93)90023-Z","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136888566","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Growth of narrow gap epilayers and p-n junctions on silicon for infrared detectors arrays 红外探测器阵列用硅上窄隙薄膜和p-n结的生长
Infrared physics Pub Date : 1993-06-01 DOI: 10.1016/0020-0891(93)90015-Y
C. Boschetti, P.H.O. Rappl, A.Y. Ueta, I.N. Bandeira
{"title":"Growth of narrow gap epilayers and p-n junctions on silicon for infrared detectors arrays","authors":"C. Boschetti,&nbsp;P.H.O. Rappl,&nbsp;A.Y. Ueta,&nbsp;I.N. Bandeira","doi":"10.1016/0020-0891(93)90015-Y","DOIUrl":"10.1016/0020-0891(93)90015-Y","url":null,"abstract":"<div><p>Lead telluride epilayers and <em>p-n</em> junctions were grown on silicon substrates by hot wall epitaxy in order to construct monolithic infrared (IR) detectors arrays, using II-a fluorides as buffer layers. Schottky barriers were also made in the same epilayers to compare the figures of merit. The <em>p-n</em> junctions had performances comparable with the metal barriers and both devices had noise sources in addition to the expected thermal and background ones.</p></div>","PeriodicalId":81524,"journal":{"name":"Infrared physics","volume":"34 3","pages":"Pages 281-287"},"PeriodicalIF":0.0,"publicationDate":"1993-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0020-0891(93)90015-Y","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"53081868","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}
引用次数: 20
A new multi-channel heterodyne polarimeter for plasma current and electron density measurements 一种用于等离子体电流和电子密度测量的新型多通道外差偏振计
Infrared physics Pub Date : 1993-04-01 DOI: 10.1016/0020-0891(93)90007-T
John Howard
{"title":"A new multi-channel heterodyne polarimeter for plasma current and electron density measurements","authors":"John Howard","doi":"10.1016/0020-0891(93)90007-T","DOIUrl":"10.1016/0020-0891(93)90007-T","url":null,"abstract":"<div><p>A spatially-scanning phase-sensitive heterodyne far-infrared (FIR) polarimeter/interferometer for measurement of plasma current and electron densities is described. The instrument utilizes a rotating diffraction grating wheel for the dual purpose of spatially scanning the plasma cross section and providing a Doppler frequency offset for heterodyne detection purposes. Only two detectors are required to obtain accurate interferometric and polarimetric information for 15 discrete spatial chords. A novel approach to the optical processing of the initially linearly polarized probe beam allows the Faraday rotation of the vibrational ellipse to be unambiguously encoded as a phase modulation on the intermediate frequency carrier signals extracted from the two detectors. The plasma birefringence can be recovered from the corresponding amplitude modulation.</p></div>","PeriodicalId":81524,"journal":{"name":"Infrared physics","volume":"34 2","pages":"Pages 175-189"},"PeriodicalIF":0.0,"publicationDate":"1993-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0020-0891(93)90007-T","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"53081310","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}
引用次数: 12
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