Destruction of Superconductivity by Laser Light

Testardi, L. R.

doi:10.1103/physrevb.4.2189

Cited by 202 publications

(75 citation statements)

References 8 publications

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“…The interaction of light with superconducting samples is long known to perturb superconductivity [1][2][3][4] , which can be used as a probing mechanism for optoelectronic applications [5][6][7][8][9][10][11][12][13] . In general, photons of energy greater than the Cooper pair binding energy (2∆) can initiate a chain of pair-breaking events resulting in a deviation of the quasiparticle and pair densities from their equilibrium values.…”

mentioning

confidence: 99%

Ultrafast linear kinetic inductive photoresponse of YBa2Cu3O7−δ meander-line structures by photoimpedance measurements

Atikian

Ghamsari

Anlage

et al. 2011

Applied Physics Letters

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We report the experimental demonstration of the linear kinetic-inductive photoresponse of thin-film YBa 2 Cu 3 O 7−δ (YBCO) meander-line structures, where the photoresponse amplitude, full-width-halfmaximum (FWHM), and rise-time are bilinear in the incident optical power and bias current. This bilinear behavior reveals a trade-off between obtaining high responsivity and high speed photodetection. We also report a rise-time as short as 29ps in our photoimpedance measurements.The interaction of light with superconducting samples is long known to perturb superconductivity 1-4 , which can be used as a probing mechanism for optoelectronic applications 5-13 . In general, photons of energy greater than the Cooper pair binding energy (2∆) can initiate a chain of pair-breaking events resulting in a deviation of the quasiparticle and pair densities from their equilibrium values. Typically, these distributions depend on temperature, optical power and wavelength, thermal boundary conditions, and material properties such as electron-electron and electron-phonon interactions times, electron density, coherence length, penetration depth, and geometry 6,14 . While determining the spatial and temporal distribution of quasiparticles and pairs under a time-varying optical illumination is a profound problem in non-equilibrium superconductivity, many of the important concepts of such an interaction for device applications can be captured by means of a much simpler and more phenomenological approach, namely the kinetic inductance model 13 . Within the kinetic inductance model the presence of the superconductive condensate, at a macroscopic level, can be adequately modeled by an additional inductive channel for charge transport. The optically initiated pair breaking mechanism, within this framework, should be interpreted as the spatial and temporal variations of the kinetic inductance and the normal resistance of the superconducting specimen.Many researchers have experimentally studied the kinetic inductive photoresponse of superconducting thin films through photoimpedance measurements 6,15 . In photoimpedance measurements, light induced changes in the microwave impedance of the superconducting structure are measured by an external high-frequency circuit. In its simplest form, the specimen is externally biased with a dc current and connected to a fast oscilloscope in series with a high bandwidth amplifier; absorption of optical photons then changes the impedance of the sample and produces a transient voltage response. A number a) Author to whom correspondence should be addressed. Electronic address: haatikia@maxwell.uwaterloo.ca of previous works have reported photoimpedance measurements on different superconductors mainly concluding that: 1) the resistive photoresponse dominates at temperatures well below the critical temperature (T c ), whereas the kinetic inductive response becomes the main mechanism of photoresponse close to T c ; 2) In the kinetic inductive regime the photoresponse could be very fast, with a rise time as low as 50...

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mentioning

confidence: 99%

Ultrafast linear kinetic inductive photoresponse of YBa2Cu3O7−δ meander-line structures by photoimpedance measurements

Atikian

Ghamsari

Anlage

et al. 2011

Applied Physics Letters

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“…Hal ini juga yang mengakibatkan ada dua kelas dalam sistem pencitraan ini, yaitu pencitraan global atau tanggapan global [3] dan pencitraan lokal [4]. Sistem pencitraan lokal ini kemudian dikembangkan oleh Divin, dkk.…”

Section: Pendahuluanunclassified

Pencitraan 2d Dan 3d Optical Beam Induced Voltage Menggunakan Sensor Fotoresistor

Warsito¹,

Suciyati²,

Harnani³

et al. 2010

MST

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AbstrakArtikel ini menunjukkan sebuah metode untuk memahami sistem pencitraan OBIV (optical beam induced voltage) yang biasanya menggunakan sistem laser scanning microscopy. Sistem pencitraan OBIV ini memanfaatkan sensor fotoresistor sebagai sampel uji yang sekaligus dapat digunakan untuk menganalisis homogenitas tanggapannya. Resolusi dari sistem pencitraan ini masih terlalu rendah yaitu sekitar 350µm disebabkan oleh besarnya diameter cahaya jatuh. Hasil pencitraan OBIV menginformasikan bahwa fotoresistor memberikan tanggapan optimal ketika cahaya jatuh pada bagian tengah permukaannya. AbstractStudy of 2D and 3D Optical Beam Induced Voltage Imaging Using Photoresistor Sensor. This article shows a method to study OBIV (optical beam induced voltage) imagerie system, that usually employ a laser scanning microscopy system. The OBIV imagerie system developed use a photoresistor sensor as a sample and simultaneously it can be used for analyzing its inhomogeneity response. Resolution of the system is still low, about 350µm due to high value of incident light diameter. The results inform that photoresistor sensors gave an optimum response if the incident light hits the center of sensible zone.

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“…A particular problem with preferentially tetragonal Nb 3 Sn is that the manner in which externally applied strain is transferred to the microstructure is very different from preferentially cubic Nb 3 Sn. To paraphrase Testardi [201]: 'An applied stress may first cause (in part) domain rotation which can lead to 'macroscopic' sample strains but little or no microscopic strains'.…”

Section: Superconducting Properties Of A15 Nb-sn and Bcc Nb Thin Filmsmentioning

confidence: 99%

“…The strain sensitivity of V 3 Si was investigated by Testardi [201], and it was argued that the strain sensitivity is mainly related to changes in the vibrational properties of the crystal. In order to investigate the possibility that strain affects the electronic properties of the crystal, the author relies on a simple rigid band model.…”

Section: Strain Sensitivity: Electronic and Vibrational Propertiesmentioning

confidence: 99%

An experimental and computational study of srain sensitivity in superconducting Nb3Sn

Mentink

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This work is the result of efforts by many people, both in a professional and a personal sense. During my time in Berkeley I had the opportunity to work with friendly and supportive people who were pushing back scientific boundaries, regarding the limits of superconducting high field technology. It is an odd but good experience to read papers from various authors detailing one scientific breakthrough or another, and then to meet them in person. Being a multi-cultural hub, Berkeley also allowed me to meet and become friends with people from all corners of this planet.Along the way, people have been instrumental in making this research happen. At LBNL, Jonathan Slack, Reuben Mendelsberg, and Andre Anders allowed me to use their lab for a rather extended period of time thus allowing for the fabrication of thin films, and have helped in various other ways along the years. The people at Ohio State University have helped by repeatedly performing heat capacity measurements on Nb 3 Sn bulk samples which were kindly supplied by Wilfried Goldacker of the Karlsruhe Institute of Technology. In particular I would like to thank Mike Susner of the Ohio State University, who came to the lab in the weekends just to make sure my samples would get measured. John Bonevich of the National Institute of Science and Technology was kind enough to perform characterization work on some of the Nb-Sn thin films we made, which included the STEM image on the cover. A lot of the experimental work was made possible with software and hardware designed at the University of Twente (such as VI by Bennie ten Haken), and I have gotten useful recommendations and assistance along the way, such as the advice on thin film fabrication from Frank Roesthuis. Professors Marcel ter Brake, Herman ten Kate, David Larbalestier, and Frances Hellman were kind enough to write letters of recommendation which contributed to getting the CSC student fellowship award. Vladimir Kresin of LBNL was kind enough to answer various questions related to the microscopic properties of Nb 3 Sn and comment on the description of microscopic theory in this thesis.Shane Cybart and Stephen Wu have assisted Edwin Dollekamp and myself in attempting to do some very fancy experiments. Edwin, from the University of Twente, took on a complicated research topic and I was impressed with how far he managed to get in that work, and Shane and Stephen invested time in the evenings and weekends to make it happen. Professor Orlandos previous investigations of Nb 3 Sn were an inspiration for some of the work described in this thesis, and he was kind enough to answer questions by email and over the phone. Derek Stewart of the Cornell NanoScale Science and Technology Facility helped me to get familiar with density functional theory calculations and computing clusters and made the suggestion of using Quantum Espresso ab-initio software. Robert Ryne and Steve Gourlay of LBNL helped me getting access to sizeable supercomputing resources at NERSC which were needed for this research.My friends and family st...

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Destruction of Superconductivity by Laser Light

Cited by 202 publications

References 8 publications

Ultrafast linear kinetic inductive photoresponse of YBa2Cu3O7−δ meander-line structures by photoimpedance measurements

Ultrafast linear kinetic inductive photoresponse of YBa2Cu3O7−δ meander-line structures by photoimpedance measurements

Pencitraan 2d Dan 3d Optical Beam Induced Voltage Menggunakan Sensor Fotoresistor

An experimental and computational study of srain sensitivity in superconducting Nb3Sn

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