Terahertz radiation from coherent phonons excited in semiconductors

Tani, Masahiko; Fukasawa, Ryoichi; Abe, Hajime; Matsuura, Shuji; Sakai, Kiyomi; Nakashima, S.

doi:10.1063/1.367007

Cited by 92 publications

(48 citation statements)

References 15 publications

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“…2 + 4 X i j jd ij j 2 (n i ; n j ) " i ; " j + ! (12) where denotes the heavy-hole and conduction band, i and j are the subband indices, i j are the subband energies, d ij is the dipole matrix element between level i and j, a n d n i j is the population of the subbands summed over perpendicular momenta. We note that the second part of Eqn.…”

Section: Coupled Intersubband-plasmon Phonon Modes In Quantum Wellsmentioning

confidence: 99%

Coherent phonons in condensed media

Dekorsy¹,

Cho²,

Kurz³

2000

Topics in Applied Physics

137

127

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Abstract. The impulsive excitation and phase-sensitive detection of coherent phonons and phonon-polaritons provide a detailed insight i n to the dynamical properties of matter. The experiments are based on optical pump-probe techniques with femtosecond time resolution. These techniques enable the detection of amplitude and phase of the coherent lattice motion simultaneously. F requencies in the THz range and dephasing times in the picosecond range can be obtained with high accuracy. Especially in semiconductors and semiconductor heterostructures, where a coherent phonon mode and free carriers are excited simultaneously, important information about carrier-phonon interaction far away from equilibrium is obtained. This paper presents an overview of recent a c hievements in this vivid eld of condensed matter physics.

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Section: Coupled Intersubband-plasmon Phonon Modes In Quantum Wellsmentioning

confidence: 99%

Coherent phonons in condensed media

Dekorsy¹,

Cho²,

Kurz³

2000

Topics in Applied Physics

137

127

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“…Interesting phenomena based upon coherent phonon generation were previously reported by a variety of experiments [2,3], for examples, ultrafast control of coherent phonons by using a pair of femtosecond laser pulses with an appropriate interval [4,5], the observation of vibronic wavepackets in time domain [6], and the generation of the frequency comb over 100 THz [7]. Furthermore, it was demonstrated that narrowband terahertz waves can be emitted by coherent phonon generation in various kinds of semiconductors such as Te [8,9], GaAs [10], GaAs/AlAs multiple quantum wells [11], (Pb,Cd)Te [12], InSb [13][14][15], and Li(In,Ga)(S,Se) [16].…”

Section: Introductionmentioning

confidence: 99%

Terahertz radiation induced by coherent phonon generation via impulsive stimulated Raman scattering in paratellurite

et al. 2014

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We report on the observation of terahertz radiation in a non-centrosymmetric insulating oxide, paratellurite (α-TeO2) by irradiation of a femtosecond laser pulse at room temperature. In the power spectrum of the terahertz radiation, an intensity fringe pattern with a period of ∼ 0.25 THz shows up below 3 THz. It can be reproduced by taking into account the effective generation length for the terahertz radiation with a poor phase-matching condition. In addition, a temporal oscillation component appears in the radiated terahertz wave with a frequency of ∼ 3.71 THz, which is in good agreement with the center frequency of the Raman active longitudinal optical (LO) E mode. On the basis of comprehensive polarized optical and Raman spectroscopic studies, we explain the generation mechanism of the temporal oscillation component in terms of the coherent phonon generation via impulsive stimulated Raman scattering.

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“…Here ε T , ε I denote the refractive indices of LiNbO 3 and c the velocity of light in vacuum. The susceptibilities χ P , χ R , which are related to the parametric and Raman scattering processes, respectively, are given by the following expressions [16,22]:…”

Section: Expressions For the Parametric Gain And Physical Interpretationmentioning

confidence: 99%

The generation and linewidth control of terahertz waves by parametric processes

Shikata

Kawase

Ito

2003

Electron Comm Jpn Pt II

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SUMMARYIn this article, we discuss broadband-tunable terahertz-wave parametric generation (TPG) via stimulated polariton scattering and techniques for narrowing the output spectrum of sources based on this phenomenon. The TPG effect, which is observed when a LiNbO 3 crystal is excited with nanosecond pulses from a Nd:YAG laser, has a gain bandwidth of over 500 GHz. After carrying out experiments aimed at converting the TPG effect into a high-power source of terahertz waves, we used our TPG light source for Fourier spectroscopy in the terahertz band. In addition, we were able to narrow the spectral bandwidth of the terahertz emission down to the Fourier limit (spectral purity ∆n/n ~ 10 -4 ) by applying the method of optical injection seeding to the TPG using light from a wavelengthtunable semiconductor laser. When we used the light from this injection-seeded TPG source for the spectroscopy of water vapor in the terahertz region, we confirmed a resolution below 100 MHz (0.003 cm -1 ). Our final version of an injection-seeded TPG light source exhibited peak powers of over 300 mW (dynamic range > 10 6 ), and a frequency tunability of 0.7 to 2.4 THz. We anticipate that this compact nonlinear-optics-based terahertz wave light source, which can operate at ordinary temperatures and is structurally simple, can become an effective tool for scientific and technological research in the terahertz region.

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Terahertz radiation from coherent phonons excited in semiconductors

Cited by 92 publications

References 15 publications

Coherent phonons in condensed media

Coherent phonons in condensed media

Terahertz radiation induced by coherent phonon generation via impulsive stimulated Raman scattering in paratellurite

The generation and linewidth control of terahertz waves by parametric processes

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