Yoshitaka Yoda, Kyoko Okada, Hongxin Wang, Stephen P Cramer, Makoto Seto
{"title":"High-resolution monochromator for iron nuclear resonance vibrational spectroscopy of biological samples.","authors":"Yoshitaka Yoda, Kyoko Okada, Hongxin Wang, Stephen P Cramer, Makoto Seto","doi":"10.7567/jjap.55.122401","DOIUrl":"https://doi.org/10.7567/jjap.55.122401","url":null,"abstract":"<p><p>A new high-resolution monochromator for 14.4-keV X-rays has been designed and developed for the Fe nuclear resonance vibrational spectroscopy of biological samples. Higher flux and stability are especially important for measuring biological samples, because of the very weak signals produced due to the low concentrations of Fe-57. A 24% increase in flux while maintaining a high resolution below 0.9 meV is achieved in the calculation by adopting an asymmetric reflection of Ge, which is used as the first crystal of the three-bounce high-resolution monochromator. The small cost resulting from a 20% increase of the exit beam size is acceptable to our biological applications. The higher throughput of the new design has been experimentally verified. A fine rotation mechanics that that combines a weak-link hinge with a piezoelectric actuator was used for controlling the photon energy of the monochromatic beam. The resulting stability is sufficient to preserve the intrinsic resolution.</p>","PeriodicalId":89163,"journal":{"name":"Japanese journal of applied physics. Part 1, Regular papers & short notes","volume":"55 12","pages":""},"PeriodicalIF":0.0,"publicationDate":"2016-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.7567/jjap.55.122401","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"35883868","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}
A Zomorrodian, N J Wu, Y Song, S Stahl, A Ignatiev, E Brady Trexler, C A Garcia
{"title":"Micro Photo Detector Fabricated of Ferroelectric-Metal Heterostructure.","authors":"A Zomorrodian, N J Wu, Y Song, S Stahl, A Ignatiev, E Brady Trexler, C A Garcia","doi":"10.1143/JJAP.44.6105","DOIUrl":"https://doi.org/10.1143/JJAP.44.6105","url":null,"abstract":"<p><p>The anomalous photovoltaic effect (APE) in ferroelectric thin films has been utilized for the development of an optical micro-detector active in the visible range (from 350 to 800 nm). La-doped Pb(Zr,Ti)O(3) (PLZT) ferroelectric films epitaxially grown on Pt(001)/Mg(001) substrate were fabricated into micro-detector arrays and characterized as to their optical response. The Au/PLZT/Pt/MgO device was self-polarized in the as-deposited form with the polarization vector perpendicular to film surface. The heterostructure photovoltage response ranged from 100 to 200 mV, and the photocurrent was ~30 nA/cm(2) for devices of ~250 μm diameter under illumination of 100 mW/cm(2) at wavelengths from 400 to 580 nm. Such micro-detectors can be used for optical sensors in MEMS devices as well as for electrical stimulators of biological cells.</p>","PeriodicalId":89163,"journal":{"name":"Japanese journal of applied physics. Part 1, Regular papers & short notes","volume":"44 2005","pages":"6105-6108"},"PeriodicalIF":0.0,"publicationDate":"2005-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1143/JJAP.44.6105","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"29798319","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}