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Terahertz conductivity of thin gold films at the metal-insulator percolation transition
- M. Walther, D. G. Cooke, Craig Sherstan, M. Hajar, Mark R. Freeman, F. A. Hegmann
- 10 September 2007
Terahertz time-domain spectroscopy is used to measure the complex conductivity of nanometer-thick gold films evaporated on silicon substrates in the far-infrared spectral region from… Expand
Generation of 1.5 microJ single-cycle terahertz pulses by optical rectification from a large aperture ZnTe crystal.
We demonstrate the generation muJ-level, single-cycle terahertz pulses by optical rectification from a large-aperture ZnTe single crystal wafer. Energies up to 1.5 muJ per pulse and a spectral range… Expand
Terahertz pulse induced intervalley scattering in photoexcited GaAs.
Nonlinear transient absorption bleaching of intense few-cycle terahertz (THz) pulses is observed in photoexcited GaAs using opticalpump--THz-probe techniques. A simple model of the electron transport… Expand
Polyynes as a model for carbyne: synthesis, physical properties, and nonlinear optical response.
- Sara Eisler, A. Slepkov, +4 authors R. Tykwinski
- Medicine, Chemistry
- Journal of the American Chemical Society
- 3 February 2005
With the Fritsch-Buttenberg-Wiechell rearrangement as a primary synthetic route, a series of conjugated, triisopropylsilyl end-capped polyynes containing 2-10 acetylene units has been assembled. In a… Expand
Size vs surface: tuning the photoluminescence of freestanding silicon nanocrystals across the visible spectrum via surface groups.
- M. Dasog, G. B. De los Reyes, L. Titova, F. A. Hegmann, J. Veinot
- Materials Science, Medicine
- ACS nano
- 8 September 2014
The syntheses of colloidal silicon nanocrystals (Si-NCs) with dimensions in the 3-4 nm size regime as well as effective methodologies for their functionalization with alkyl, amine, phosphine, and… Expand
The surprising nonlinear optical properties of conjugated polyyne oligomers.
- A. Slepkov, F. A. Hegmann, Sara Eisler, E. Elliott, R. Tykwinski
- Chemistry, Medicine
- The Journal of chemical physics
- 30 March 2004
Polyynes represent a unique class of conjugated organic compounds. The third-order nonlinear optical response of polyynes has been extensively modeled theoretically, and it is generally believed that… Expand
Phase diagram of the ultrafast photoinduced insulator-metal transition in vanadium dioxide
Effective mass anisotropy of hot electrons in nonparabolic conduction bands of n-doped InGaAs films using ultrafast terahertz pump-probe techniques.
- F. Blanchard, D. Golde, +8 authors F. A. Hegmann
- Materials Science, Medicine
- Physical review letters
- 31 August 2011
The anisotropic effective mass of energetic electrons in an isotropic, nonparabolic conduction band is revealed using ultrafast THz-pump-THz-probe techniques in a n-doped InGaAs semiconductor thin… Expand
Synthesis, structure, and nonlinear optical properties of diarylpolyynes.
A series of alpha,omega-diarylpolyynes has been synthesized. In addition to the synthesis of three hexaynes (3a-c), a notably improved synthesis of 1,16-diphenylhexadecaoctayne (5) is described. The… Expand
Ultrafast photoresponse in microbridges and pulse propagation in transmission lines made from high-T/sub c/ superconducting Y-Ba-Cu-O thin films
We report our femtosecond time-resolved measurements of the photoresponse of microbridges in YBa/sub 2/Cu/sub 3/O/sub 7-x/ (YBCO) thin films, performed using an electrooptic sampling technique. Our… Expand