APS March Meeting 2014
Volume 59, Number 1
Monday–Friday, March 3–7, 2014;
Denver, Colorado
Session T14: Invited Session: Novel Nonlinear Spectroscopic Techniques for Understanding Material Structure and Function
11:15 AM–2:15 PM,
Thursday, March 6, 2014
Room: 301-303
Sponsoring
Unit:
DLS
Chair: Henry Kapteyn, JILA, CU Boulder and NIST
Abstract ID: BAPS.2014.MAR.T14.1
Abstract: T14.00001 : Nonlinear terahertz spectroscopy of every phase of matter
11:15 AM–11:51 AM
Preview Abstract
Abstract
Author:
Keith Nelson
(MIT)
Tabletop generation of intense terahertz (THz) pulses with peak field
amplitudes in the 0.1-1 MV/cm range and field enhancement up to 10 MV/cm and
beyond has enabled nonlinear responses in solids, liquids, and gases to be
driven by THz fields [1,2]. This has enabled nonlinear THz spectroscopy and
THz coherent control of a wide variety of samples. In semiconductors and
other samples, acceleration of carriers to multi-eV energies by THz
excitation pulses has resulted in strong changes in carrier mobility and, in
some cases, impact ionization that can lead to dramatic changes in
conductivity [3,4]. Tunneling ionization has resulted in insulator-metal
phase transitions with associated structural phase transitions [5]. In
liquids and gases, THz pulses have produced molecular alignment and
orientation [6,7]. Coherent control over molecular rotational motion
involving multiple rotational levels has been demonstrated [8]. Recent
nonlinear THz spectroscopy and prospects for more extensive THz coherent
control over molecules and materials will be discussed.\\[4pt]
[1] ``Generation of 10 $\mu $J ultrashort THz pulses by optical
rectification,'' K.-L. Yeh, M.C. Hoffmann, J. Hebling, and K.A. Nelson,
\textit{Appl. Phys. Lett}. \textbf{90}, 171121 (2007).\\[0pt]
[2] ``Generation of high power tunable multicycle terahertz pulses,'' Z. Chen,
X. Zhou, C.A. Werley, and K.A. Nelson, \textit{Appl. Phys. Lett}., \textbf{99}, 071102 (2011).\\[0pt]
[3] ``Impact ionization in InSb probed by THz pump -- THz probe
spectroscopy,'' M.C. Hoffmann, J. Hebling, H.Y. Hwang, K.-L. Yeh, and K.A.
Nelson, \textit{Phys. Rev. B} \textbf{79}, 161201 (R) (2009).\\[0pt]
[4] ``Nonlinear terahertz metamaterials via field-enhanced carrier dynamics
in GaAs,'' \textit{Phys. Rev. Lett}. \textbf{110}, 217404 (2013).\\[0pt]
[5] ``Terahertz-field-induced insulator-to-metal transition in vanadium
dioxide metamaterial,'' M. Liu, et al., \textit{Nature} \textbf{487}, 345 (2012).\\[0pt]
[6] ``Terahertz Kerr effect,'' M.C. Hoffmann, N.C. Brandt, H.Y. Hwang, K.-L.
Yeh, and K.A. Nelson, \textit{Appl. Phys. Lett.} \textbf{95}, 231105 (2009). \\[0pt]
[7] ``Molecular orientation and alignment by intense single-cycle THz
pulses,'' S. Fleischer, Y. Zhou, R.W. Field, and K.A. Nelson, \textit{Phys. Rev. Lett}. \textbf{107},
163603 (2011).\\[0pt]
[8] ``Commensurate two-quantum coherences induced by time-delayed THz
fields," S. Fleischer, R.W. Field, and K.A. Nelson, \textit{Phys. Rev. Lett.} \textbf{109}, 123603
(2012).
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2014.MAR.T14.1