Bulletin of the American Physical Society
2017 Annual Meeting of the APS Mid-Atlantic Section
Volume 62, Number 19
Friday–Sunday, November 3–5, 2017; Newark, New Jersey
Session H4: Optics-II |
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Chair: Bart Kahr, New York University Room: 225, Campus Center, NJIT |
Saturday, November 4, 2017 2:00PM - 2:36PM |
H4.00001: Single qubit gates for neutral atom quantum computers Invited Speaker: David Weiss I will outline an approach to quantum computing using neutral atoms trapped in a 3D optical lattice. In particular, I will describe in detail experiments that address the quantum information at any site in a 125 site lattice with high fidelity and low cross talk, as well as ongoing work to fill vacancies in the 3D array. [Preview Abstract] |
Saturday, November 4, 2017 2:36PM - 3:12PM |
H4.00002: The most optically active triangle? Invited Speaker: Bart Kahr Scientists intuitively believe that some things are more chiral than others; the molecule CHFDT seems `less chiral' than CHFClBr and the latter is likely more optically active in solution. Observations of this kind have long inspired chemists to try to correlate pseudoscalar properties with measures of chirality associated with models of molecules. But, we can do no better than inventing chirality functions for geometric figures, foregoing correlations with properties. Much thinking has gone into the development of chirality functions for triangles in 2D (Buda, auf de Heyde, Mislow. 1992). However, it was recognized that there are innumerable chirality functions and none are privileged. Every triangle is `the most chiral triangle' by some measure (Rassat, Fowler, 2003) We turned the question inside out by seeking out the most optically active triangle, then expected to seek the chirality function best adapted to the answer. We simulated the Mueller matrix by propagating basis polarization states through nanoscopic, thin gold triangular prisms of equal volume, with triangular faces of 700 square nm, and bases varying from 400 to 1000 nm. The extrema are isosceles. The polarimetric responses of such objects are complex and belie simply interpretations in terms of geometry. [Preview Abstract] |
Saturday, November 4, 2017 3:12PM - 3:24PM |
H4.00003: Quantum Cascade Superluminescent Spiral Cavity Devices at 8 $\mu $m with Various Doping Characteristics Yezhezi Zhang, Mei Zheng, Abigail Pitarresi, Abanti Basak, Deborah Sivco, Claire Gmachl Optical Coherence Tomography (OCT) is an imaging technique with biomedical applications; the system requires a superluminescent (SL) light source that has a low temporal coherence for high resolution and high power for imaging through a thicker sample. We focus on the mid-IR region because many fundamental ro-vibrational transitions happen in this `fingerprint' region. Quantum cascade superluminescent (QCSL) emitters are excellent sources for this wavelength. Prior work dealt with QCSL devices with an emission wavelength of 5 $\mu $m, and in this work we extended our work to 8 $\mu $m because there are more interesting biomolecular absorption peaks from proteins and lipids. We designed and fabricated 8 $\mu $m spiral cavity SL emitters with various doping characteristics. Using FT-IR spectrometry, the devices were characterized at various temperatures. Compared to injector region doped devices, active region doped devices showed a slower gain narrowing in the electroluminescent region. Doping in the active region contributes to suppressed lasing, but it does not affect the coherence length that was 320 $\mu $m for both type of devices at lasing threshold at 120 K. The active region doped device had a 7.5 mW power output at 120 K, which makes it a good candidate for an OCT system. [Preview Abstract] |
Saturday, November 4, 2017 3:24PM - 3:36PM |
H4.00004: Doppler variance analysis for high sensitivity morphological OCT imaging Farzana Zaki, Dylan Renaud, Benjamin Litvin, Nishat Sadia, Jamia Gilles, Xuan Liu Optical coherence tomography (OCT) is a cross-sectional imaging modality based on light interferometry. While the magnitude of an OCT signal is generally used for sample structural imaging, sample information is also encoded in the phase of the signal. In particular, the phase of an OCT signal varies with sub-resolution change in optical path length. This behavior can be exploited to track sample displacement with sub-nanometer sensitivity. For example, in prior studies Doppler phase shift has been extracted from phase-resolved OCT signals for vasculature visualization, blood flow measurement, and optical coherence elastography. In addition, the spatial variation of Doppler phase is closely related to morphological characteristics of the sample. In this work, we describe a Doppler variance OCT (DV-OCT) technology that generates morphological images using both the amplitude and phase of a complex OCT signal through Doppler variance analysis. Our results suggest that DV-OCT has better signal to noise ratio performance and sensitivity compared to amplitude OCT imaging, while preserving spatial resolution for morphological characterization of the sample. [Preview Abstract] |
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