Recent Submissions

  • Highly sensitive terahertz measurement of layer thickness using a two-cylinder waveguide sensor 

    Theuer, M.; Beigang, R.; Grischkowsky, Daniel R.; Theuer, M.; Grischkowsky, Daniel R. (Applied Physics Letters, 2010-08-17)
    We report on the layer thickness determination on dielectrically coated metal cylinders using terahertz (THz) time-domain spectroscopy. A considerable sensitivity increase of up to a factor of 150 is obtained for layers ...
  • Adiabatic compression of terahertz waves using metal flares 

    Theuer, M.; Beigang, R.; Grischkowsky, Daniel R.; Theuer, M.; Grischkowsky, Daniel R. (Applied Physics Letters, 2010-05-14)
    We report on the adiabatic free-space coupling of broadband terahertz (THz) radiation through a subwavelength gap using metal flares. Amplitude coupling ratios better than 30% are obtained by optimizing the curvature. This ...
  • Flare coupled metal parallel-plate waveguides for high resolution terahertz time-domain spectroscopy 

    Theuer, M.; SreeHarsha, K. S.; Grischkowsky, Daniel R.; Theuer, M.; Grischkowsky, Daniel R. (Journal of Applied Physics, 2010-03-12)
    We report on a new coupling scheme for high resolution terahertz spectroscopy of microcrystalline films using parallel-plate waveguides. Metal flares are used to couple the terahertz radiation into and out of the waveguide. ...
  • High- Q terahertz Bragg resonances within a metal parallel plate waveguide 

    SreeHarsha, K. S.; Laman, N.; Grischkowsky, Daniel R.; SreeHarsha, K. S.; Grischkowsky, Daniel R. (Applied Physics Letters, 2009-03-06)
    One-dimensional (1D) Bragg waveguides are demonstrated at terahertz (THz) frequencies. Lithographically made 1D symmetric and asymmetric dielectric gratings on metallized high conductivity Si chips are incorporated within ...
  • Transport and quantum walk of nonclassical light in coupled waveguides 

    Rai, A.; Agarwal, Girish Saran; Perk, Jacques H. H.; Rai, A.; Perk, Jacques H. H.; Agarwal, Girish Saran (Physical Review A, 2008-10-08)
    We study the transport and quantum walk of nonclassical light in an array of coupled waveguides which have novel properties like very low decoherence and thus making them ideal for storage of quantum information. We show ...
  • Terahertz conductivity of thin metal films 

    Laman, N.; Grischkowsky, Daniel R.; Laman, N.; Grischkowsky, Daniel R. (Applied Physics Letters, 2008-08-05)
    The conductivities of thin Al, Au, and Ag films were measured via their transmission at terahertz frequencies. The conductivities of all the films, particularly the thinner films and Al films, were much smaller than their ...
  • Quantum optical spring 

    Rai, A.; Agarwal, Girish Saran; Rai, A.; Agarwal, Girish Saran (Physical Review A, 2008-07-22)
    We study the dynamics of the quantum optical spring, i.e., a spring whose spring constant undergoes discrete jumps depending on the quantum state of another system. We show the existence of revivals and fractional revivals ...
  • Underlying terahertz vibrational spectrum of explosives solids 

    Melinger, J. S.; Laman, N.; Grischkowsky, Daniel R.; Laman, N.; Grischkowsky, Daniel R. (Applied Physics Letters, 2008-07-08)
    Using waveguide terahertz time-domain spectroscopy, we demonstrate the measurement of the underlying terahertz vibrational spectrum of the explosive solids hexahydro-1,3,5-trinitro-1,3,5-triazine, and 2,4,6-trinitrotoluene. ...
  • Integrated waveguide-coupled terahertz microcavity resonators 

    George, P. A.; Manolatou, Christina; Rana, F.; Bingham, A. L.; Grischkowsky, Daniel R.; Bingham, A. L.; Grischkowsky, Daniel R. (Applied Physics Letters, 2007-11-09)
    We demonstrate integrated square terahertz microcavity resonators side coupled to waveguides. We present the microcavity transmission spectra for different resonator sizes and coupling strengths. The measured quality factors ...
  • Reduced conductivity in the terahertz skin-depth layer of metals 

    Laman, N.; Grischkowsky, Daniel R.; Laman, N.; Grischkowsky, Daniel R. (Applied Physics Letters, 2007-03-23)
    The terahertz conductivities of plates of Cu and Al were measured to remain the same at 295 and 77 K using waveguide terahertz time domain spectroscopy (THz-TDS). This result was true for a variety of commercial alloys and ...
  • High Q, one-dimensional terahertz photonic waveguides 

    Bingham, A. L.; Grischkowsky, Daniel R.; Bingham, A. L.; Grischkowsky, Daniel R. (Applied Physics Letters, 2007-02-28)
    A one-dimensional (1D) photonic metal parallel plate waveguide is presented in the spectral range of 0.5-3 THz that has high throughput and stop bands with up to the experimental limit of 40 dB of dynamic range. By ...
  • Line narrowing of terahertz vibrational modes for organic thin polycrystalline films within a parallel plate waveguide 

    Melinger, J. S.; Laman, N.; SreeHarsha, K. S.; Grischkowsky, Daniel R.; Laman, N.; Grischkowsky, Daniel R. (Applied Physics Letters, 2006-12)
    Waveguide terahertz time-domain spectroscopy is used to demonstrate the narrowing of vibrational lines for a thin polycrystalline film of 1,2-dicyanobenzene in a parallel plate metal waveguide. When compared to corresponding ...
  • THz Zenneck surface wave (THz surface plasmon) propagation on a metal sheet 

    Jeon, T.; Grischkowsky, Daniel R.; Jeon, T.; Grischkowsky, Daniel R. (Applied Physics Letters, 2006-02-08)
    We present an experimental study of the propagation of the THz Zenneck surface wave on an aluminum sheet, now more commonly denoted as the THz surface plasmon (TSP). Here, the TSP pulse is generated by coupling the THz ...
  • THz parallel plate photonic waveguides 

    Bingham, A.; Zhao, Y.; Grischkowsky, Daniel R.; Bingham, A.; Grischkowsky, Daniel R. (Applied Physics Letters, 2005-07-26)
    We have observed narrowband transmission or rejection in the frequency spectra of THz pulses transmitted through air-spaced parallel plate photonic waveguides. These waveguides have one of the metal plates covered by a ...
  • THz Sommerfeld wave propagation on a single metal wire 

    Jeon, T.; Zhang, J.; Grischkowsky, Daniel R.; Jeon, T.; Grischkowsky, Daniel R. (Applied Physics Letters, 2005-04-12)
    We report an experimental and theoretical study of THz Sommerfeld wave propagation on a single copper wire. THz pulses are optoelectronically generated and launched onto 0.52-mm-diam copper wire, and the guided THz pulses ...
  • Adiabatic compression of parallel-plate metal waveguides for sensitivity enhancement of waveguide THz time-domain spectroscopy 

    Zhang, J.; Grischkowsky, Daniel R.; Zhang, J.; Grischkowsky, Daniel R. (Applied Physics Letters, 2005-02-02)
    We demonstrate the efficient coupling of THz pulses into and out of an adiabatically compressed parallel-plate metal waveguide. The plate separation of the 63.5-mm long, compressed waveguide was fixed at 103 �m at the ...
  • Direct optoelectronic generation and detection of sub-ps-electrical pulses on sub-mm-coaxial transmission lines 

    Jeon, T.; Grischkowsky, Daniel R.; Jeon, T.; Grischkowsky, Daniel R. (Applied Physics Letters, 2004-12-20)
    We report efficient direct optoelectronic generation of sub-ps-THz pulses on 50 Ohm coaxial transmission lines with a 330 micro-m diameter solid copper outer tube filled with Teflon containing the 80 micro-m diameter inner ...
  • Observation of a new type of THz resonance of surface plasmons propagating on metal-film hole arrays 

    Qu, Dongxia; Grischkowsky, Daniel R.; Qu, Dongxia; Grischkowsky, Daniel R. (Physical Review Letters, 2004-11-04)
    Highly conducting metal-film subwavelength hole arrays, lithographically fabricated on high-resistivity silicon wafers in optical contact with thick silicon plates, have been characterized by terahertz time-domain spectroscopy ...
  • Planar THz quasioptics 

    Dai, J.; Coleman, S.; Grischkowsky, Daniel R.; Dai, J.; Grischkowsky, Daniel R. (Applied Physics Letters, 2004-08-09)
    Two-dimensional (2D) quasioptical elements are demonstrated as guiding structures in the THz frequency regime. A planar polyethylene lens is incorporated in a parallel metal plate structure and is shown to focus guided THz ...
  • Characterization of Cfa1, a monofunctional acyl carrier protein involved in the biosynthesis of the phytotoxin coronatine 

    Seidle, H.; Rangaswamy, V.; Couch, R.; Bender, Carol L.; Parry, R. J.; Rangaswamy, V.; Bender, Carol L. (Journal of Bacteriology, 2004-04)
    Cfa1 was overproduced in Escherichia coli and Pseudomonas syringae, and the degree of 4�-phosphopantetheinylation was determined. The malonyl-coenzyme A:acyl carrier protein transacylase (FabD) of P. syringae was overproduced ...

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