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Displaying records 51 to 60 of 82 records.
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51. Mueller matrix bidirectional reflectance distribution function measurements and modeling of diffuse reflectance standards
Topic: Optics
Published: 4/20/2011
Authors: Thomas Avery Germer, Heather J Patrick
Abstract: We measure the Mueller matrix bidirectional reflectance distribution function (BRDF) of pressed and sintered powdered polytetrafluoroethylene (PTFE) reflectance standards for an incident angle of 75°. Rotationally averaged Mueller matrices from the m ...

52. Mueller matrix ellipsometry of artificial non-periodic line edge roughness in presence of finite numerical aperture
Topic: Optics
Published: 4/20/2011
Authors: Thomas Avery Germer, Martin Foldyna, Brent Bergner
Abstract: We used azimuthally-resolved spectroscopic Mueller matrix ellipsometry to study a periodic silicon line structure with and without artificially-generated line edge roughness (LER). The unperturbed, reference grating profile was determined from multip ...

53. Multiple-time-scale blinking in InAs quantum dot single photon sources
Topic: Optics
Published: 4/16/2014
Authors: Marcelo Ishihara Davanco, C S Hellberg, Serkan Ates, Antonio Badolato, Kartik A Srinivasan
Abstract: We use photon correlation measurements to study blinking in single, epitaxially-grown selfassembled InAs quantum dots situated in circular Bragg grating and microdisk cavities. The normalized second-order correlation function g(2)(t) is studied ac ...

54. Nanoscale Imaging of Photocurrent and Efficiency in CdTe Solar Cells
Topic: Optics
Published: 10/15/2014
Authors: Leite Marina, maxim abashin, Henri J Lezec, anthony gianfrancesco, Talin Alec, Nikolai B Zhitenev
Abstract: The local collection characteristics of grain interiors and grain boundaries in thin film CdTe polycrystalline solar cells are investigated using scanning photocurrent microscopy. The carriers are locally generated by light injected through a small ...

55. Nonthermal continuum toward Sagittarius B2(N-LMH)
Topic: Optics
Published: 4/11/2007
Authors: J M Hollis, P R Jewell, A Remijan, Francis John Lovas
Abstract: An analysis of continuum antenna temperatures observed in theGBTspectrometer bandpasses is presented for observations toward Sgr B2(N-LMH). Since 2004, we have identified four new prebiotic molecules toward this source by means of rotational transiti ...

56. Nurturing a Disruptive Technology for Thermodynamic Metrology
Topic: Optics
Published: 9/12/2014
Author: Zeeshan Ahmed
Abstract: This presenation lays out a case, based on economic and technologic considerations, that the present technologies for temperature and pressure measurement are ripe for disruption. We argue that a better use of research funds is to identify and nuture ...

57. Optimal Laser Scan Path for Localizing a Fluorescent Particle in Two or Three Dimensions
Topic: Optics
Published: 7/16/2012
Authors: Gregg M. Gallatin, Andrew J. Berglund
Abstract: Localizing a fluorescent particle by scanning a focused laser in its vicinity and analyzing the detected photon stream provides real-time information for a modern class of feedback control systems for particle tracking and trapping. We present a sim ...

58. Phase sensitive parametric optical metrology: Exploring the limits of 3-dimensional optical metrology
Topic: Optics
Published: 4/4/2012
Authors: Richard M Silver, Jing Qin, Bryan M Barnes, Hui H. Zhou, Ronald G Dixson, Francois R. Goasmat
Abstract: There has been much recent work in developing advanced optical metrology applications that use imaging optics for critical dimension measurements, defect detection and for potential use with in-die metrology applications. Sensitivity to nanometer sca ...

59. Polarized Optical Scattering Signatures from Biological Materials
Topic: Optics
Published: 1/11/2010
Authors: W. E. Martin, E. Hesse, J. H. Hough, William Sparks, C. S. Cockell, Z. Ulanowski, Thomas Avery Germer, B. Kaye
Abstract: The polarization of laser light backscattered from biological samples has been measured over the wavelength range 350 to 850nm. Incident circular, linearly polarized, and unpolarized light produces significant spectrally prominent scattered polari ...

60. Probing coherence in microcavity frequency combs via optical pulse shaping
Topic: Optics
Published: 8/29/2012
Authors: Fahmida Ferdous, Houxun H. Miao, Pei-Hsun Wang, Daniel E. Leaird, Kartik A Srinivasan, Lei Chen, Vladimir A Aksyuk, Andrew M Weiner
Abstract: Recent investigations of microcavity frequency combs based on cascaded four-wave mixing have revealed a link between the evolution of the optical spectrum and the observed temporal coherence. Here we study a silicon nitride microresonator for which ...

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