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Nanotechnology

Nanophotonics

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Displaying 151 - 175 of 278

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

Multi-functional integrated photonics in the mid-infrared with suspended AlGaAs on silicon

September 18, 2019
Author(s)
Jeff Chiles, Nima Nader, Eric Stanton, Daniel Herman, Galan Moody, Biswarup Guha, Kartik Srinivasan, Scott Diddams, Ian Coddington, Nathan Newbury, Jeff Shainline, Sae Woo Nam, Richard Mirin, Jiangang Zhu, Juliet Gopinath, Connor Fredrick
The microscale integration of mid- and longwave-infrared photonics could enable the development of fieldable and reliable chemical sensors. The choice of material platform immediately determines the strength and types of optical nonlinearities available

Experimental Variation of Magnification Calibration for Localization Microscopy

September 15, 2019
Author(s)
Craig R. Copeland, Bojan R. Ilic, Samuel M. Stavis
We study the experimental variation of a localization microscope due to temporal and thermal factors, enabling elucidation of the discrepancy between transillumination brightfield and epi-illumination fluorescence of an aperture array for magnification

Indistinguishable photons from deterministically integrated single quantum dots in heterogeneous GaAs/Si3N4 quantum photonic circuits

September 15, 2019
Author(s)
Peter Schnauber, Anshuman Singh, Johannes Schall, Suk I. Park, Jin Dong Song, Sven Rodt, Kartik Srinivasan, Stephan Reitzenstein, Marcelo I. Davanco
With in-situ electron beam lithography we deterministically integrate single InAs quantum dots into heterogeneous GaAs/Si3N4 waveguide circuits. Through microphotoluminescence spectroscopy, we show on-chip quantum dot emission of single, postselected

A photonic pH sensor based on photothermal spectroscopy

September 12, 2019
Author(s)
Zeeshan Ahmed, Nathan J. Castro, Matthew R. Hartings
Although the determination of pH is a standard laboratory measurement, new techniques capable of measuring pH are being developed to facilitate modern technological advances. Bio-industrial processing, tissue engineering, and intracellular environments

Global alignment of solution-based single-wall carbon nanotube films via machine-vision controlled filtration

September 11, 2019
Author(s)
Jeffrey A. Fagan, Angela R. Hight Walker, Adam J. Biacchi, Joshua S. Walker, William D. Rice, Thomas Searles, Valerie A. Kuehl
Over the past decade, substantial progress has been made in the chemical processing (chiral enrichment, length sorting, handedness selectivity, and filling substance) of single- wall carbon nanotubes (SWCNTs). Recently, it was shown that large

Indistinguishable photons from deterministically integrated single quantum dots in heterogeneous GaAs/Si3N4 quantum photonic circuits

August 30, 2019
Author(s)
Peter Schnauber, Anshuman Singh, Johannes Schall, Suk I. Park, Jin Dong Song, Sven Rodt, Kartik Srinivasan, Stephan Reitzenstein, Marcelo I. Davanco
Silicon photonics enables the integration of multi-functional quantum networks on a chip. Inclusion of quantum emitters acting as on-demand single-photon source or photon non-linearity is highly desirable to boost scalability and functionality. Towards

PHOTONIC THERMOMETRY: UPENDING 100 YEAR-OLD PARADIGM IN TEMPERATURE METROLOGY

August 1, 2019
Author(s)
Zeeshan Ahmed, Nikolai N. Klimov, Thomas P. Purdy, Tobias K. Herman, Kevin O. Douglass, Ryan P. Fitzgerald
For the past century, industrial temperature measurements have relied on resistance measurement of a thin metal wire or thin metal film whose resistance varies with temperature. Today’s resistance thermometers can routinely measure temperatures with

Efficient telecom-to-visible spectral translation through ultra-low power nonlinear nanophotonics

June 24, 2019
Author(s)
Xiyuan Lu, Gregory Moille, Qing Li, Daron Westly, Anshuman Singh, Ashutosh Rao, Su P. Yu, Travis Briles, Scott Papp, Kartik Srinivasan
The ability to spectrally translate lightwave signals in a compact, low-power platform is at the heart of the promise of nonlinear nanophotonic technologies. For example, a device to connect the telecommunications band with visible and short near-infrared

pyLLE: a Fast and User Friendly Lugiato-Lefever Equation Solver

May 24, 2019
Author(s)
Gregory T. Moille, Qing Li, Xiyuan Lu, Kartik Srinivasan
The Lugiato-Lefever Equation (LLE), first developed to provide a description of spatial dissipative structures in optical systems, has recently made a significant impact in the integrated photonics community, where it has been adopted to help understand

Quantum Frequency Conversion of a Quantum Dot Single-Photon Source on a Nanophotonic Chip

May 20, 2019
Author(s)
Anshuman Singh, Qing Li, Shunfa Liu, Ying Yu, Xiyuan Lu, Christian Schneider, Sven Hofling, John Lawall, Varun Verma, Richard Mirin, Sae Woo Nam, Jin Liu, Kartik Srinivasan
Single self-assembled InAs/GaAs quantum dots are promising bright sources of indistinguishable photons for quantum information science. However, their distribution in emission wavelength, due to inhomogeneous broadening inherent to their growth, has

Ultrafast Optical Pulse Shaping using Dielectric Metasurfaces

May 2, 2019
Author(s)
Shawn M. Divitt, Wenqi Zhu, Cheng Zhang, Henri Lezec, Amit Agrawal
Simultaneous control of individual frequency-comb lines, and their modulation at the repetition-rate of an ultrafast laser represents the ultimate limit of optical pulse shaping. Remarkable progress in mode-locked lasers and chirped pulse amplifiers

A solid-state source of strongly entangled photon pairs with high brightness and indistinguishability

April 22, 2019
Author(s)
Jin Liu, Rongbin Su, Yuming Wei, Beimeng Yao, Saimon Filipe Covre da Silva, Ying Yu, Jake Iles-Smith, Kartik Srinivasan, Armando Rastelli, Juntao Li, Xuehua Wang
The generation of high-quality entangled photon pairs has been being a long-sought goal in modern quan-tum communication and computation. To date, the most widely-used entangled photon pairs are gener-ated from spontaneous parametric downconversion, a

UV LEDs Based on p-i-n Core-Shell AlGaN/GaN Nanowire Heterostructures Grown by N-polar Selective Area Epitaxy

March 20, 2019
Author(s)
Matthew Brubaker, Kristen Genter, Alexana Roshko, Paul T. Blanchard, Bryan T. Spann, Todd E. Harvey, Kris A. Bertness
Ultraviolet light-emitting diodes (UV LEDs) fabricated from N-polar AlGaN/GaN core-shell nanowires with p-i-n structure produced electroluminescence at 365 nm with 5x higher intensities than similar GaN homojunction LEDs. The improved characteristics were

Metrological Assessment of Single-Walled Carbon Nanotube Materials by Optical Methods

March 1, 2019
Author(s)
Jeffrey Fagan, Angela Hight Walker, Ming Zheng, Lefebvre Jacques, Paul Finnie
This chapter discusses the metrology - i.e. the science of measurement - of single-wall carbon nanotubes (SWCNTs) with optical methods. Professor Mildred ("Millie") Dresselhaus was a strong advocate for nanotube metrology and a pioneer in carbon nanotube

Chip-integrated visible-telecom entangled photon pair source for quantum communication

January 21, 2019
Author(s)
Xiyuan Lu, Qing Li, Daron Westly, Gregory Moille, Anshuman Singh, Vikas Anant, Kartik Srinivasan
Photon pair sources are fundamental blocks for quantum entanglement and quantum communication. Recent studies in silicon photonics have documented promising characteristics for photon pair sources within the telecommunications band, including sub-milliwatt

Spin-mechanical coupling of an InAs quantum dot embedded in a mechanical resonator

December 14, 2018
Author(s)
S G. Carter, A S. Bracker, Garnett W. Bryant, M Kim, C S. Kim, M Zalalutdinov, M. K. Yakes, C Czarnocki, J Casara, M Scheibner, D Gammon
We demonstrate strain-induced coupling between a hole spin in a quantum dot and mechanical motion of a cantilever. The optical transitions of quantum dots integrated into GaAs mechanical resonators are measured synchronously with the motion of the driven

Axisymmetric scalable magneto-gravitational trap for diamagnetic particle levitation

December 11, 2018
Author(s)
Kristine A. Bertness, John P. Houlton, Max L. Chen, Matthew D. Brubaker, Charles T. Rogers
We report an axisymmetric magnetic trap design for levitating diamagnetic particles. The magnetic traps each consist of two iron pole pieces passively driven by a neodymium iron boron (NdFeB) permanent magnet. The magnetic field configuration between the

Metal Organic Framework-Coated Optical VOC Gas Sensor

November 8, 2018
Author(s)
Yangyang Zhao, Mona E. Zaghloul, Yigal Lilach, Kurt Benkstein, Stephen Semancik
We report a metal organic framework (MOF)-coated nanohole array based plasmonic gas sensor. Arrays of 200 nm circular holes are fabricated with a period of 400 nm. 10 nm thick MOF is coated on the sensor platform to provide high sensitivity and real-time

Fabrication and Testing of Photonic Thermometers

October 24, 2018
Author(s)
Nikolai Klimov, Zeeshan Ahmed
In recent years, a push for developing novel silicon photonic devices for telecommunications has generated a vast knowledge base that is now being leveraged for developing sophisticated photonic sensors. Silicon photonic sensors seek to exploit the strong

Photonic waveguide to free-space Gaussian beam extreme mode converter

October 10, 2018
Author(s)
Sangsik Kim, Daron Westly, Brian J. Roxworthy, Qing Li, Alexander Yulaev, Kartik Srinivasan, Vladimir Aksyuk
Integration of photonic chips with atomic, micromechanical, chemical and biological systems can advance science and open many possibilities in chip-scale devices and technology. Compact photonic structures for direct coupling of light between high-index
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