Spectral interferometric polarised coherent anti-Stokes Raman spectroscopy

We have developed an interferometric implementation of coherent anti-Stokes Raman scattering (CARS) which enables broadband coherent Raman spectroscopy free from non-resonant background (NRB), with a signal strength proportional to concentration. Spectra encode mode symmetry information into the amplitude response which can be directly compared to polarised spontaneous Raman spectra. The method requires only passive polarisation optics and is suitable for a wide range of laser linewidths and pulse durationsComment: 5 pages, 3 figures, submitted to PR

Charge hopping revealed by jitter correlations in the photoluminescence spectra of single CdSe nanocrystals

Spectral fluctuations observed in single CdSe/ZnS nanocrystals at 5 K are found to be entirely the result of discrete charge hops in the local environment of the nanocrystal, which occur at a rate comparable to the acquisition time of a single spectrum. We show that intervals between discrete spectral hops introduce a correlation between the successive measurements of the emission wavelength of single CdSe nanocrystals. This correlation can be recovered even in the presence of noise, but is shown to be sensitive to the experimental acquisition time, in good agreement with theory. However, we only find correlations for the smaller of the two nanocrystal sizes studied and discuss this in terms of size-dependent time scales correlated with the amount of excess energy dissipated in the nanocrystal due to hot-carrier relaxation. © 2010 The American Physical Societ

Anomalous power laws of spectral diffusion in quantum dots: A connection to luminescence intermittency

We show that the wandering of transition frequencies in colloidal quantum dots does not follow the statistics expected for ordinary diffusive processes. The trajectory of this anomalous spectral diffusion is characterized by a root t dependence of the squared deviation. The behavior is reproduced when the electronic states of quantum dots are assumed to interact with environments such as, for example, an ensemble of two-level systems, where the correlation times are distributed according to a power law similar to the one generally attributed to the dot's luminescence intermittency

Sea surface effects on phase coherence in Emulated Bistatic Radar systems

In this paper we consider the phase degradation performance between an ideal radar path and that of a sea surface reflected signal (over a variety of sea surface heights) in an Emulated Bistatic Radar scenario. The sea surface model employed is a ID Fractal model that is based on the Generalised Weierstrass Function. Graphical and Tabular results are provided that demonstrate the absolute performance using the simulation technique discussed, for sea heights up to 0.9m

Inverse synthetic aperture radar

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Brief of Amici Curiae in United States v. Windsor and Hollingsworth v. Perry of National Women's Law Center, Williams Institute, and Women's Legal Groups

A group of eight Williams Institute-affiliated scholars on sexual orientation and gender law joined with the National Women’s Law Center and eight other leading women’s legal groups to file a friend-of-the-court brief arguing that, like laws that discriminate based on sex, laws that discriminate based on sexual orientation warrant heightened judicial scrutiny because, among other considerations, such laws are based on overbroad gender stereotypes.  The scholars on the brief were Nancy Polikoff, Vicki Schultz, Nan D. Hunter, Christine A. Littleton, Devon Carbado, Cheryl Harris, Seana Shiffrin, and Brad Sears.  Counsel on the brief were David Codell, the Williams Institute’s Visiting Arnold D. Kassoy Senior Scholar of Law and Legal Director; Marcia Greenberger and Emily Martin of the National Women’s Law Center; and the law firm of Paul Hastings LLP

Brief of Amici Curiae in United States v. Windsor and Hollingsworth v. Perry of National Women's Law Center, Williams Institute, and Women's Legal Groups

A group of eight Williams Institute-affiliated scholars on sexual orientation and gender law joined with the National Women’s Law Center and eight other leading women’s legal groups to file a friend-of-the-court brief arguing that, like laws that discriminate based on sex, laws that discriminate based on sexual orientation warrant heightened judicial scrutiny because, among other considerations, such laws are based on overbroad gender stereotypes.  The scholars on the brief were Nancy Polikoff, Vicki Schultz, Nan D. Hunter, Christine A. Littleton, Devon Carbado, Cheryl Harris, Seana Shiffrin, and Brad Sears.  Counsel on the brief were David Codell, the Williams Institute’s Visiting Arnold D. Kassoy Senior Scholar of Law and Legal Director; Marcia Greenberger and Emily Martin of the National Women’s Law Center; and the law firm of Paul Hastings LLP

A method for achieving super-resolved widefield CARS microscopy

We propose a scheme for achieving widefield coherent anti-Stokes Raman scattering (CARS) microscopy images with sub-diffraction-limited resolution. This approach adds structured illumination to the widefield CARS configuration [Applied Physics Letters 84, 816 (2004)]. By capturing a number of images at different phases of the standing wave pattern, an image with up to three times the resolution of the original can be constructed. We develop a theoretical treatment of this system and perform numerical simulations for a typical CARS system, which indicate that resolutions around 120 nm are obtainable with the present scheme. As an imaging system, this method combines the advantages of sub-diffraction-limited resolution, endogenous contrast generation, and a wide field of view. © 2010 OS