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Physics

Optical physics and communications

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Displaying 251 - 275 of 861

Scattering mechanism for quadratic evolution of depolarization

January 15, 2020
Author(s)
Thomas A. Germer
It was recently demonstrated theoretically, when the polarimetric properties of a material depend only upon the direction transverse to that of propagation (long coherence length regime), depolarization in transmission evolves quadratically with material

Detector-Agnostic Phase-Space Distributions

January 9, 2020
Author(s)
Thomas Gerrits, Adriana Lita, Sae Woo Nam, Jan Sperling, David Phillips, Jacob Bulmer, G Thekkadath, A. Eckstein, T Wolterink, J Lugani, Wolfgang Vogel, G.S. Agarwal, Christine Silberhorn, Ian Walmsley
The representation of quantum states via phase-space functions constitutes an intuitive technique to characterize light. However, the reconstruction of such distributions is challenging as it demands specific types of detectors and detailed models thereof

Calibration of free-space and fiber-coupled single-photon detectors

December 20, 2019
Author(s)
Thomas Gerrits, Alan L. Migdall, Joshua C. Bienfang, John H. Lehman, Sae Woo Nam, Jolene D. Splett, Igor Vayshenker, Chih-Ming Wang
We measure the detection efficiency of single-photon detectors at wavelengths near 851 nm and 1533.6 nm. We investigate the spatial uniformity of one free-space-coupled single-photon avalanche diode and present a comparison between fusion-spliced and

Milliwatt-threshold visible-telecom optical parametric oscillation using silicon nanophotonics

December 20, 2019
Author(s)
Xiyuan Lu, Gregory Moille, Anshuman Singh, Qing Li, Daron Westly, Ashutosh Rao, Su P. Yu, Travis Briles, Scott Papp, Kartik Srinivasan
The on-chip creation of coherent light at visible wavelengths is of interest to many applications in spectroscopy, sensing, and metrology. Towards that goal, here we propose and demonstrate the first on-chip visible-telecom optical parameteric oscillator

2019 Topical Meeting on Optical Interference Coatings: Manufacturing Problem Contest

December 2, 2019
Author(s)
Catherine C. Cooksey, Daniel Poitras, Li Li, Michael Jacobson
For the Seventh Manufacturing Problem contest, participants were asked to fabricate on a provided N-BK7 substrate a challenging filter with specific s-polarization transmittance spectra at angles of incidence of 10° and 50°, covering a wavelength range

Repeated Measurements with Minimally Destructive Partial-Transfer Absorption Imaging

December 2, 2019
Author(s)
Ian B. Spielman, Ana Valdes Curiel, Dimitris Trypogeorgos, Erin Marshall, Nathan Lundblad
We demonstrate partial-transfer absorption imaging as a technique for repeatedly imaging an ultracold atomic ensemble with minimal perturbation. We prepare an atomic cloud in a state that is dark to the imaging light and then use a microwave pulse to

Chapter 3: Calibration and Characterization of Optical Radiometers

December 1, 2019
Author(s)
Giuseppe Zibordi, Kenneth Voss, B. Carol Johnson, James Mueller
Procedures for calibrating and characterizing optical radiometers, including the determination of characteristics peculiar to underwater sensors, are presented in this chapter. The characterizations are considered essential to verify the compliance with

A kilopixel array of superconducting nanowire single-photon detectors

November 18, 2019
Author(s)
Varun Verma, Adriana Lita, Sae Woo Nam, R P. Mirin, Emma Wollman, William Farr, Matthew Shaw
We present a 1024-element imaging array of superconducting nanowire single photon detectors (SNSPDs) using a 32x32 row-column multiplexing architecture. Large arrays are desirable for applications such as imaging, spectroscopy, or particle detection.

SAGE: A proposal for a Space Atomic Gravity Explorer

November 15, 2019
Author(s)
Nathan Newbury, Chris Oates, Jun Ye, Guglielmo Tino, A Bassi, G Bianco, K Bongs, L Cacciapuoti, M. L. Chiofalo, X Chen, A Derevianko, W Ertme, N Gaaloul, Patrick Gill, P. W. Graham, J. M. Hogan, L Iess, Mark Kasevich, H Katori, Carsten Klempt, X Lu, Long-Sheng Ma, H Muller, A Peters, N Poli, Rasel E, G Rosi, A Roura, C Salomon, S Schiller, W Sleich, D Schlippert, F Schreck, C Schubert, Sorrentino F, Uwe Sterr, J. W. Thomsen, G Vallone, F Vetrano, P Villoresi, W von Klitzing, P Wolf, Nan Yu, M.S. Zhan
The proposed mission \Space Atomic Gravity Explorer (SAGE) has the scientifi c objective to investigate gravitational waves, dark matter, and other fundamental aspects of gravity as well as the connection between gravitational physics and quantum physics

Advanced technologies for quantum photonic devices based on epitaxial quantum dots

October 11, 2019
Author(s)
Tian M. Zhao, Yan Chen, Yu Ying, Li Qing, Marcelo I. Davanco, Jin Liu
Photonic quantum technology is creating breakthroughs in both fundamental quantum science and applications such as quantum communication, computation and sensing. Regarded as artificial atoms due to the discrete energy levels they support, semiconductor

Microscopic origin of the chiroptical response of optical media

October 11, 2019
Author(s)
Matthew S. Davis, Wenqi Zhu, Jay K. Lee, Henri Lezec, Amit Agrawal
The potential for enhancing the optical activity of natural chiral media using engineered nanophotonic components has been central in the quest towards developing next-generation circular-dichroism spectroscopic techniques. Through confinement and

State-independent quantum tomography of a single-photon state by photon-number-resolving measurements

October 10, 2019
Author(s)
Thomas Gerrits, Adriana Lita, Sae Woo Nam, Rajveer Nehra, Aye Win, Miller Eaton, Niranjan Sridhar, R. Shahrokhshahi, O Pfister
A narrowband single-photon state was generated by heralding cavity-enhanced spontaneous parametric downconversion in a PPKTP optical parametric oscillator. The Wigner quasiprobability distribution function was reconstructed, in a state-independent manner

Broadband Resonator-Waveguide Coupling for Efficient Extraction of Octave Spanning Microcombs

October 1, 2019
Author(s)
Gregory Moille, Qing Li, Travis Briles, Su P. Yu, Tara E. Drake, Xiyuan Lu, Ashutosh Rao, Daron Westly, Scott Papp, Kartik Srinivasan
Frequency combs spanning over an octave have been successfully demonstrated on-chip in Kerr nonlinear microresonators, thanks to their large effective nonlinearity and ability to support a suitable dispersion profile. Efficient extraction of intracavity

Kerr Microresonator Soliton Frequency Combs at Cryogenic Temperatures

September 27, 2019
Author(s)
Gregory Moille, Xiyuan Lu, Ashutosh Rao, Qing Li, Daron Westly, Leonardo Ranzani, Scott Papp, Mohammad Soltani, Kartik Srinivasan
We present measurements of silicon nitride nonlinear microresonators and frequency comb generation at cryogenic temperatures as low as 7 K. A resulting two orders of magnitude reduction in the thermo-refractive coefficient relative to room-temperature

Nonlinear Silicon waveguides produce tunable frequency combs spanning 2.0-8.5 ?m

September 25, 2019
Author(s)
Nima Nader, Abijith S. Kowligy, Jeffrey T. Chiles, Eric J. Stanton, Henry R. Timmers, Alexander J. Lind, Kimberly Briggman, Scott Diddams, Flavio Caldas da Cruz, Richard Mirin, Sae Woo Nam, Daniel M. Lesko
We present fully air clad suspended-silicon waveguides for efficient nonlinear interactions limited only by the silicon transparency. Novel fork-shaped couplers provide efficient input ( 2 dB) and broadband 3 dB output coupling spanning 6.0-8.5 υm

Near-infrared photonic phase-change properties of transition metal ditellurides.

September 23, 2019
Author(s)
Albert Davydov, Sergiy Krylyuk, Yifei Li, Akshay Singh, Rafael Jaramillo
We use the (Mo,W)Te2 system to explore the potential of transition metal dichalcogenides (TMDs) as phasechange materials for integrated photonics. We measure the complex optical constant of MoTe2 in both the 2H and 1T’ phases by spectroscopic ellipsometry

A review of protocols for Fiducial Reference Measurements of water-leaving radiance for validation of satellite remote sensing data over water

September 20, 2019
Author(s)
Kevin Ruddick, Emmanuel Boss, Alexandre Castagna, Robert Frouin, Alex Gilerson, Martin Hieronymi, B. Carol Johnson, Joel Kuusk, Zhongping Lee, Michael Ondrusek, Viktor Vabson, Riho Vendt, Kenneth Voss, Giuseppe Zibordi
This paper reviews the state of the art of protocols for measurement of water-leaving radiance in the context of Fiducial Reference Measurements (FRM) of water reflectance for satellite validation. Measurement of water reflectance requires the measurement
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