Magneto-optical harmonics generation spectroscopy of semiconductors and dielectrics Текст научной статьи по специальности «Нанотехнологии»

Magneto-optical harmonics generation spectroscopy of semiconductors and dielectrics

V.V. Pavlov

Ioffe Institute, 194021, St. Petersburg, Russia

[email protected]

Nonlinear spectroscopy based on optical harmonics generation enables a possibility for giving new information as compared with linear optical phenomena. This is due to the fundamental difference between selection rules for single-photon and multi-photon processes [1]. The nonlinear optical phenomenon such as optical second harmonic generation (SHG) results from the space-inversion symmetry operation breaking. SHG plays particular role in the fundamental studies of noncentrosymmetric bulk materials, as well as surface and interface states of centrosymmetric media. Moreover, it can be used as an important tool for studying electronic, crystallographic and spin structures of magnetically ordered materials, including antiferromagnets [2,3]. However, SHG studies of magnetically ordered materials at energetically narrow excitonic states are rather scarce.

New nonlinear magneto-optical phenomena in different types of semiconductors and magnetic dielectrics will be discussed. Various aspects of nonlinear optical spectroscopy will be analysed such as polarization, temperature and field dependencies. Excitonic phenomena associated with optical harmonics in antiferromagnetically ordered materials will be considered. The possibility of visualization of antiferromagnetic domains indistinguishable by linear optics methods will be demonstrated. Excitonic nonlinear magneto-optical phenomena in semiconductors will be discussed. The possibilities of optical harmonics generation technique for revealing new mechanisms for nonlinear optical interaction on exciton states will be shown [4].

Financial support from the Russian Science Foundation (project 24-12-00348) is acknowledged.

[1] Y.R. Shen, The principles of nonlinear optics, (Wiley, New York, 1984).

[2] M. Fiebig, V.V. Pavlov, R.V. Pisarev, Second-harmonic generation as a tool for studying electronic and magnetic structures of crystals: review, J. Opt. Soc. Am. B 22, 96 (2005).

[3] F. Manfred, Nonlinear optics on ferroic materials, (Blackwell Verlag GmbH, 2023).

[4] V.V. Pavlov, Magnetic field effects in optical harmonics generation by excitons, Phys. Solid State 62, 1624 (2020).