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Title Studies of Crystal Structure Using Multiphoton Transitions in GaAs
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Publication Date
Date Accessioned
University/Publisher University of Ottawa
Abstract We demonstrate experimentally that the multiphoton ionization rate in gallium arsenide depends on the alignment of the laser polarization with respect to the crystal axis. We show real-time modulation of 1900nm laser ionization rate, through viewing transmission, which mimics the symmetry of the semiconductor crystal. We propose that the modulation in the ionization rate arises because the varying reduced effective carrier mass, as predicted by Keldysh theory. We show direct comparison of the experimental transmission modulation depth with that predicted by Keldysh theory. This opens up a novel method for real-time non-invasive crystallography of crystalline materials.
Subjects/Keywords Multiphoton Ionization; Strong-field physics; solid state; ultrafast
Language en
Country of Publication ca
Record ID handle:10393/23369
Repository ottawa
Date Indexed 2018-01-03
Issued Date 2012-01-01 00:00:00

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…Reduced effective mass of GaAs. . . . . . . . . . . . . . . . . . . . . 2.7 3.1 3.2 3.3 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8 2 4 . 8 . 9 . 10 . 11 . 12 . 14 . 16 Ionization rates in (100)GaAs for different multiphoton ionization regimes…

…state materials, we create a means of developing practical AMO applications in photonics. In the molecular regime, it was predicted that the multiphoton ionization with a laser depends on the electron distribution about the nucleus. Thus measuring the…

…eV, which is similar to the ionization potential (IP ) of 8-15eV for an atom or molecule. Thus, we would expect ab initio that the multiphoton conduction to valence band transitions within a solid should also depend on the electron…

…distribution in a unit cell. Further, we show that the multiphoton ionization behaviour for both atoms and solids are treated in a similar fashion [13]. Thus, multiphoton ionization inside a solid should also trace the electron distribution. 1.2…

…From Atoms to Solids In the case of solids, the electrons are confined within a bulk, so we will use the term ”ionization,” to refer to multiphoton transitions from the valence bands to the conduction bands. A direct comparison can be made between an…

…experiments looking at multiphoton ionization in dielectrics were performed by Gertsvolf et.al . [10]. In these experiments, several dielectrics were ionized with an 800nm laser beam, and the transmission through the sample as a function of crystal…

…3100nm so we can achieve multiphoton ionization (3 and 4 photon absorption respectively). Thus, we can eliminate any effects of two-photon absorption due to the sharp cutoff at 2 ω. Third, GaAs is not birefringent when propagating along a…

…derivatives of DFT bandstructure. 16 Chapter 3 Theory In this chapter, we look at the theoretical multiphoton ionization rate in solid materials. We use a Keldysh ionization theory in solids for all predictions. We first address why this particular theory…

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