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Physics

Optical physics and communications

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Displaying 576 - 600 of 853

Gain and Loss in active waveguides based on lithographically defined quantum dots

June 1, 2014
Author(s)
Kevin L. Silverman, Luis Miaja Avila, Varun B. Verma, Richard P. Mirin, James J. Coleman
We report on the optical gain and loss of waveguides containing lithographically defined quantum dots. Lasing action has previously been demonstrated in a nominally identical structure. Measurements are made by monitoring the transmission of a resonant

Multiheterodyne spectroscopy with optical frequency combs generated from a continuous-wave laser

May 1, 2014
Author(s)
David A. Long, Adam J. Fleisher, Kevin O. Douglass, Stephen E. Maxwell, Katarzyna E. Bielska, Joseph T. Hodges, David F. Plusquellic
Dual-drive Mach-Zehnder modulators were utilized to produce power-leveled optical frequency combs (OFCs) from a continuous-wave laser. The resulting OFCs contained up to fifty unique frequency components and spanned more than 200 GHz. Simple changes to the

Chapter 4: Fourier transform methods

April 25, 2014
Author(s)
Simon G. Kaplan, Manuel A. Quijada
Chapter 4 describes the use of Fourier Transform Spectrometers (FTS) for accurate spectrophotometry over a wide spectral range. After a brief exposition of the basic concepts of FTS operation, we discuss instrument designs and discuss their advantages and

Multiple-time-scale blinking in InAs quantum dot single photon sources

April 16, 2014
Author(s)
Marcelo I. Davanco, C S. Hellberg, Serkan Ates, Antonio Badolato, Kartik A. Srinivasan
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 across

Operation of an optically coherent frequency comb outside the metrology lab

March 13, 2014
Author(s)
Laura C. Sinclair, Ian R. Coddington, William C. Swann, Archita Hati, Kana Iwakuni, Nathan R. Newbury
Frequency combs can support cutting-edge measurements in areas that include optical clocks and oscillators, high-accuracy frequency and time transfer, precision spectroscopy from the UV to THz regimes, high-accuracy LIDAR, precise microwave photonics, and

Ultrafast optical properties of lithographically defined quantum dot amplifiers

February 10, 2014
Author(s)
Luis Miaja Avila, Varun B. Verma, James J. Coleman, Richard P. Mirin, Kevin L. Silverman
We measure the ultrafast optical response of lithographically defined quantum dot amplifiers at 40 K. Recovery of the gain mostly occurs in less than 1 picosecond, with some longer-term transients attributable to carrier heating. Recovery of the absorption

Ultra-Sensitive Chip-Based Photonic Temperature Sensor Using Ring Resonator Structures

February 3, 2014
Author(s)
Haitan Xu, Mohammad Hafezi, Jingyun Fan, Jacob Taylor, Gregory F. Strouse, Zeeshan Ahmed
Temperature is one of the most measured quantity in the world, second only to time. Recently there has been considerable interest in developing photonic temperature sensors to leverage advancements in frequency metrology. Here we show that Silicon based

Si3N4 optomechanical crystals in the resolved-sideband regime

January 27, 2014
Author(s)
Marcelo I. Davanco, Serkan Ates, Yuxiang Liu, Kartik A. Srinivasan
We demonstrate sideband-resolved Si3N4 optomechanical crystals supporting 105 quality factor optical modes at 980 nm, coupled to approximately 4 GHz frequency mechanical modes with quality factors of approximately 3000. Optomechanical electromagnetically

Optimally Focused Cold Atom Systems Obtained Using Density-Density Correlations

January 23, 2014
Author(s)
Ian B. Spielman, Andika Putra, Daniel Campbell, Ryan Price, Subhadeep De
Resonant absorption imaging is a common technique for detecting the two-dimensional column density of ultracold atom systems. In many cases, the system’s thickness along the imaging direction greatly exceeds the imaging system’s depth of field, making the

First Report on Quantum Dot Coated CMOS CID Arrays for the UV and VUV

December 13, 2013
Author(s)
Uwe Arp, Robert E. Vest, Zoran Ninkov, Ross Robinson, Suraj Bhaskaran
A technique has been developed for coating commercial off the shelf (COTS) detector arrays with a thin, uniform layer of quantum dots. The quantum deposition is accomplished using an Optomec Aerosol Jet rapid prototyping system. When illuminated by UV

Hybrid Detectors

November 29, 2013
Author(s)
Sergey V. Polyakov, Alan L. Migdall, Franco N. Wong, Ivo P. Degiovanni, Ian Walmsley, Hendrik B. Coldenstrodt-Ronge
We present an overview of e orts to improve photon-counting detection systems through the use of hybrid detection techniques such as spatial- and time-multiplexing of conventional detectors, and frequency up-conversion. We review the basic operation for

Single-Photon Sources and Detectors Book: Chapter 1: Introduction

November 29, 2013
Author(s)
Joshua C. Bienfang, Jingyun Fan, Alan L. Migdall, Sergey V. Polyakov
In the beginning there was light. And it was good. Not long thereafter people began to look for a comprehensive understanding of its nature. While the publication record starts o a little spotty, in the fth century BC the Greek philosopher Empedocles

Results of aperture area comparisons for exo-atmospheric total solar irradiance measurements

November 13, 2013
Author(s)
Bettye C. Johnson, Maritoni A. Litorja, Joel B. Fowler, Eric L. Shirley, James J. Butler, Robert A. Barnes
Exo-atmospheric solar irradiance measurements made by the solar irradiance community since 1978 incorporate limiting apertures with diameters measured by a number of metrology laboratories using a variety of techniques. Knowledge of the aperture area is a

High Resolution Frequency Comb Molecular Spectroscopy.

November 3, 2013
Author(s)
Ian R. Coddington, Alexander M. Zolot, Esther Baumann, Fabrizio R. Giorgetta, Greg B. Rieker, Jeffrey W. Nicholson, William C. Swann, Nathan R. Newbury
Frequency combs serve as an extremely high accuracy reference across broad portions of the optical spectrum. Dual frequency combs harness this accuracy and allow for fast and highly fidelity molecular spectroscopy.

Imaging topological edge states in silicon photonics

October 20, 2013
Author(s)
Mohammad Hafezi, Jingyun Fan, Alan L. Migdall, Jacob M. Taylor
Systems with topological oder exhibit exotic phenomena including fractional statistics. While most systems with topological order have been electronic, advances in our understanding of synthetic gauge fields have enabled realization of topological order in

Use of radiation pressure for measurement of high-power laser emission

October 15, 2013
Author(s)
Paul A. Williams, Joshua A. Hadler, Robert Lee, Frank Maring, John H. Lehman
We demonstrate a paradigm in absolute laser radiometry where a laser beam's power can be measured from its radiation pressure. Using an off-the-shelf high-accuracy mass scale and a 500 W Yb-doped fiber laser and a 92 kW CO2 laser, we show preliminary

Strong Casimir force reduction by metallic surface nanostructuring

September 27, 2013
Author(s)
Francesco Intravaia, Stefan T. Koev, Il Woong Jung, Albert A. Talin, Paul S. Davids, Ricardo Decca, Vladimir Aksyuk, Diego A. Dalvit, Daniel Lopez
The Casimir force is a quantum-mechanical interaction arising from vacuum fluctuations of the electromagnetic (EM) field and is technologically significant in micro- and nanomechanical systems. Despite rapid progress in nanophotonics, the goal of
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