Transient charge separation in centro-symmetric media by magneto-optic nonlinearities  (Conference Presentation)

Minh Tuan Trinh; Krishnandu Makhal; Ayesheshim Ayesheshim; Stephen Rand

doi:10.1117/12.2509026

5 March 2019 Transient charge separation in centro-symmetric media by magneto-optic nonlinearities (Conference Presentation)

Minh Tuan Trinh, Krishnandu Makhal, Ayesheshim Ayesheshim, Stephen Rand

Author Affiliations +

Proceedings Volume 10916, Ultrafast Phenomena and Nanophotonics XXIII; 1091611 (2019) https://doi.org/10.1117/12.2509026
Event: SPIE OPTO, 2019, San Francisco, California, United States

Abstract

We present the first observation of nonlinear optical response mediated by ultrafast magneto-electric (ME) rectification. The control of magnetic properties of materials by ultrafast optical field enable novel sensing technology, energy conversion, terahertz emission, and ultrafast data storage. However, the interaction of the magnetic field of light with materials is normally ignored due to low magnetic susceptibilities at high frequencies. Optical nonlinearities driven jointly by electric and magnetic field components of light provide a new route in controlling magnetic properties of bulk media. Several novel physical phenomena arise from curved motion of bound electrons driven jointly by electric and magnetic fields such as longitudinally polarized second harmonic radiation, induced transverse magnetization at the optical frequency, and charge separation along the propagation direction. We investigate an ME charge separation in pentacene semiconductors using a time-resolved second harmonic generation technique. A femtosecond laser beam acted as an optical pump with photon energy well below the bandgap of the material to induce ME charge separation. The DC electric field from the ME charge separation interacted with the optical field from a second laser beam, the probe, in a four-wave-mixing interaction that induced second harmonic (M-EFISH) generation. We also sought evidence of ME charge separation by searching for THz emission. By monitoring time-resolved M-EFISH and THz emission, we were able to study the ME charge separation dynamics for the first time.

Conference Presentation

Citation Download Citation

Minh Tuan Trinh, Krishnandu Makhal, Ayesheshim Ayesheshim, and Stephen Rand "Transient charge separation in centro-symmetric media by magneto-optic nonlinearities (Conference Presentation)", Proc. SPIE 10916, Ultrafast Phenomena and Nanophotonics XXIII, 1091611 (5 March 2019); https://doi.org/10.1117/12.2509026

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KEYWORDS

Magnetism

Magneto-optics

Transient nonlinear optics

Ultrafast phenomena

Laser beam diagnostics

Terahertz radiation

Terahertz technology

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