Two- and three-photon spectroscopy in solids

Fröhlich, D.

doi:10.1016/0960-8974(96)83610-2

Cited by 3 publications

(4 citation statements)

References 27 publications

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“…After the first theoretical treatment of two-photon processes in 1931 [5], and their first experimental demonstration in the optical range in 1963 [6], nonlinear optical techniques have established themselves as useful methods for the study of electronic properties of solids [7,8]. They complement linear tools due to different selection rules [9].…”

Section: Introductionmentioning

confidence: 99%

Second harmonic generation of cuprous oxide in magnetic fields

et al. 2020

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Recently Second Harmonic Generation (SHG) for the yellow exciton series in cuprous oxide has been demonstrated [J. Mund et al., Phys. Rev. B 98, 085203 (2018)]. Assuming perfect O h symmetry, SHG is forbidden along certain high-symmetry axes. Perturbations can break this symmetry and forbidden transitions may become allowed. We investigate theoretically the effect of external magnetic fields on the yellow exciton lines of cuprous oxide. We identify two mechanisms by which an applied magnetic field can induce a second harmonic signal in a forbidden direction. First of all, a magnetic field by itself generally lifts the selection rules. In the Voigt configuration, an additional magneto-Stark electric field appears. This also induces certain SHG processes differing from those induced by the magnetic field alone. Complementary to the manuscript by A. Farenbruch et al. [Phys. Rev. B, submitted], we perform a full numerical diagonalization of the exciton Hamiltonian including the complex valence band structure. Numerical results are compared with experimental data. :2002.12064v1 [cond-mat.mes-hall] arXiv

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Section: Introductionmentioning

confidence: 99%

Second harmonic generation of cuprous oxide in magnetic fields

et al. 2020

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“…Nonlinear optical techniques, where more than one photon is participating in an elementary excitation process are powerful tools for the investigation of electronic properties of solids [1][2][3][4]. Two-photon processes were first treated theoretically almost 90 years ago [5], the first experiments on two-photon absorption (TPA) had to wait for the advent of high power lasers more than 50 years ago [6].…”

Section: Introductionmentioning

confidence: 99%

High-resolution second harmonic generation spectroscopy with femtosecond laser pulses on excitons in Cu2O

et al. 2018

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We present a novel spectroscopic technique for second harmonic generation (SHG) using femtosecond laser pulses at 30 kHz repetition rate, which nevertheless provides high spectral resolution limited only by the spectrometer. The potential of this method is demonstrated by applying it to the yellow exciton series of Cu2O. Besides even parity states with S− and D− envelope, we also observe odd parity, P − excitons with linewidths down to 100 µeV, despite of the broad excitation laser spectrum with a full width at half maximum of 14 meV. The underlying light-matter interaction mechanisms of SHG are elaborated by a group theoretical analysis which allows us to determine the linear and circular polarization dependences, in good agreement with experiment. arXiv:1806.06854v1 [physics.optics]

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“…As shown schematically by inset in Fig. 10 We note that experiments on the measurement of SHG and THG, as well as experiments on two-and three-photon light absorption [17], may become powerful supplemental tools for studying the exciton-polariton dispersion and its modification in external electric and magnetic fields. To take into account the effect of the external magnetic field B on the THG process, the nonlinear polarization P 3ω can be written as:…”

Section: E Optical Second Harmonic Generation On Exciton-polariton Imentioning

confidence: 99%

“…The methods of nonlinear optics are two-photon absorption, optical harmonics generation, two-photon photoluminescence excitation, generation of high-density excitons and exciton-polariton condensate, four-wave mixing, etc. [12,[16][17][18][19][20] are used to study exciton states. The use of external perturbations such as a mechanical stress, electric and magnetic fields, allows obtaining new information about excitons.…”

Section: Introductionmentioning

confidence: 99%

Exciton Spectroscopy of Semiconductors by the Method of Optical Harmonics Generation (Review)

et al. 2018

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Nonlinear optical phenomena are widely used for the study of semiconductor materials. The paper presents an overview of experimental and theoretical studies of excitons by the method of optical second and third harmonics generation in various bulk semiconductors (GaAs, CdTe, ZnSe, ZnO, Cu 2 O, (Cd,Mn)Te, EuTe, EuSe), and low-dimensional heterostructures ZnSe/BeTe. Particular attention is paid to the role of external electric and magnetic fields that modify the exciton states and induce new mechanisms of optical harmonics generation. Microscopic mechanisms of harmonics generation based on the Stark effect, the spin and orbital Zeeman effects, and on the magneto-Stark effect specific for excitons moving in an external magnetic field are considered. This approach makesit possible to study the properties of excitons and to obtain new information on their energy and spin structure that is not available when the excitons are investigated by linear optical spectroscopy. As a result of these studies, a large amount of information was obtained, which allows us to conclude on the establishing of a new field of research exciton spectroscopy by the method of optical harmonics generation.

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Two- and three-photon spectroscopy in solids

Cited by 3 publications

References 27 publications

Second harmonic generation of cuprous oxide in magnetic fields

Second harmonic generation of cuprous oxide in magnetic fields

High-resolution second harmonic generation spectroscopy with femtosecond laser pulses on excitons in Cu2O

Exciton Spectroscopy of Semiconductors by the Method of Optical Harmonics Generation (Review)

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