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Ultra-long duration time-resolved spectroscopy with enhanced temporal resolution of high-Q nano-optomechanical modes using interleaved asynchronous optical sampling (I-ASOPS)

Conference on Lasers and Electro-Optics Europe - Technical Digest

Siddiqui, Aleem; Jarecki, Robert L.; Starbuck, Andrew L.; Cox, Jonathan A.

Transient responses of high-Q nano-optomechanical modes are characterized with Interleaved-ASOPS, where pump-induced transients are interrogated with multiple probe pulses. Temporal resolution increases linearly with probe-pulse-number beyond conventional ASOPS, achieving sub-ps resolution over μs durations.

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TYPE Conference YEAR 2014
ScopusOSTIDOI

Superconductive silicon nanowires using gallium beam lithography

Jarecki, Robert L.

This work was an early career LDRD investigating the idea of using a focused ion beam (FIB) to implant Ga into silicon to create embedded nanowires and/or fully suspended nanowires. The embedded Ga nanowires demonstrated electrical resistivity of 5 m-cm, conductivity down to 4 K, and acts as an Ohmic silicon contact. The suspended nanowires achieved dimensions down to 20 nm x 30 nm x 10 m with large sensitivity to pressure. These structures then performed well as Pirani gauges. Sputtered niobium was also developed in this research for use as a superconductive coating on the nanowire. Oxidation characteristics of Nb were detailed and a technique to place the Nb under tensile stress resulted in the Nb resisting bulk atmospheric oxidation for up to years.

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TYPE SAND Report YEAR 2014
OSTIDOI

Infrared plasmons on heavily-doped silicon

Journal of Applied Physics

Ginn, James C.; Jarecki, Robert L.; Shaner, Eric A.; Davids, Paul S.

We examine the long-wave infrared (LWIR) optical characteristics of heavily-doped silicon and explore engineering of surface plasmons polaritons (SPP) in this spectral region. Both phosphorus (n-type Si) and boron (p-type Si) implants are evaluated and various cap layers and thermal annealing steps are examined. The optical properties are measured using ellipsometry and fit to a Drude model for the infrared (IR) permittivity. The predicted metallic behavior for Si in the thermal IR and its impact on the spatial confinement and dispersion for surface plasmons is studied. We find that the transverse spatial confinement for a surface plasmon on highly doped Si is strongly sub-wavelength near the plasma edge, and the confinement to the surface is enhanced to greater than 10 × that of the metal confined SPP over the entire LWIR spectrum. © 2011 American Institute of Physics.

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TYPE Journal Article YEAR 2011
ScopusOSTI
Results 26–49 of 49
Results 26–49 of 49