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Physics

Optical physics and communications

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Displaying 501 - 525 of 1595

Evidence for moire excitons in van der Waals heterostructures

February 25, 2019
Author(s)
Kha Tran, Galan Moody, Travis M. Autry, Kevin L. Silverman, Fengcheng Wu, Junho Choi, Akshay Singh, Jacob Embley, Andre Zepeda, Marshall Cambel, Kyoung Kim, Amritesh Rai, Daniel Sanchez, Takashi Taniguchi, Kenji Watanabe, Li Yang, Nanshu Lu, Sanjay Banerjee, emanuel tutuc, Allan H. MacDonald, Xiaoqin Li
Recent advances in the isolation and stacking of monolayers of van der Waals materials have provided approaches for the preparation of quantum materials in the ultimate two-dimensional limit. In van der Waals heterostructures formed by stacking two

Switchable detector array scheme to reduce the effect of single-photon detector's deadtime in a multi-bit/photon quantum link

February 25, 2019
Author(s)
Cong Liu, YONGXIONG Ren, Jiapeng Zhao, MOHAMMAD MIRHOSSEINI, SEYED RAFSANJANI, GUODONG XIE, Kai Pang, Zhe Zhao, Long Li, Joshua Bienfang, Alan L. Migdall, Todd Brun, Moshe Tur, Robert Boyd, Alan Wilner
We explore the use of a switchable single-photon detector (SPD) array to reduce the effect of individual SPDs' deadtime for a multi-bit/photon quantum link such as M-orbital-angular-momentum (OAM)-encoded one. Our method uses 􀡺 SPDs with a controllable 􀡹 ×

Broadband generation of photonic spin-controlled arbitrary accelerating light beams in the visible

February 13, 2019
Author(s)
Qingbin Fan, Wenqi Zhu, Yuzhang Liang, Pengcheng Huo, Cheng Zhang, Amit Agrawal, Kun Huang, Xiangang Luo, Yanqing Lu, Chengwei Qiu, Henri Lezec, Ting Xu
Bending light along arbitrary curvatures is a captivating and popular notion, triggering unprecedented endeavors in achieving quasi-diffraction-free propagation along a curved path in free-space. Much effort has been devoted to achieving this goal in

Towards Photonic based Pascal Realization as a Primary Pressure Standard

February 7, 2019
Author(s)
Jacob E. Ricker, Jay H. Hendricks, Patrick F. Egan, Jack Stone, Kevin O. Douglass, Gregory Scace
New techniques using refractometry have enabled gas pressure to be measured using laser interferometry. Two key techniques have been studied at NIST which include the Fixed Length Optical Cavity (FLOC) and the Variable Length Optical Cavity (VLOC). The

Coherent light brightens the frontier of quantum science and technology

February 1, 2019
Author(s)
Jun Ye, Margaret Murnane
The precise control of coherent light across a vast spectral span has enabled revolutionary progress in precision measurements and the quantum control of atomic, molecular, and condensed matter systems. The laser was invented about 60 years ago (1) — 30

Improving the Retrieval of XCO2 from Total Carbon Column Network Solar Spectra

January 3, 2019
Author(s)
Joseph Mendonca, Kimberly Strong, Debra Wunch, Geoffrey Toon, David Long, Joseph T. Hodges, Vincent T. Sironneau
High-resolution absorption spectra of the a^1 ∆_g←X^3 Σ_g^- O2 band measured using cavity ring-down spectroscopy were fitted using the Voigt and speed-dependent Voigt line shapes. We found that the speed-dependent Voigt line shape was better able to model

Controlling femtosecond filament propagation using externally driven gas motion

January 2, 2019
Author(s)
Jared K. Wahlstrand, Nihal Jhajj, H M. Milchberg
The thermal density depression (or “density hole”) produced by a high repetition rate femtosecond filament in air acts as a negative lens, altering the propagation of the filament. We discuss the effects of externally driven gas motion on these density

Diagonal Slice Four-Wave Mixing: Natural Separation of Coherent Broadening Mechanisms

December 13, 2018
Author(s)
Travis M. Autry, Geoffrey M. Diederich, Mark E. Siemens
We present an ultrafast coherent spectroscopy data acquisition scheme that samples slices of the time domain used in multidimensional coherent spectroscopy to achieve faster data collection than full spectra. We derive analytical expressions for resonance

Controlling the polarization and vortex charge of attosecond high-harmonic beams via simultaneous spin-orbit momentum conservation

December 10, 2018
Author(s)
Kevin Dorney, Laura Rego, Nathan J. Brooks, Julio San Roman, Chen-Ting Liao, Jennifer Ellis, Dmitriy Zusin, Christian Gentry, Quynh Nguyen, Justin Shaw, Antonio Picon, Luis Plaja, Henry C. Kapteyn, Margaret M. Murnane, Carlos Hernandez-Garcia
Optical interactions are governed by both spin and angular momentum conservation laws, which serve as a tool for controlling light-matter interactions or elucidating electron dynamics and structure of complex systems. Here, we uncover a form of