From Event: SPIE Optical Engineering + Applications, 2016
Ultrashort THz pulses overlap with resonances through which magnetism or ferroelectricity can be probed or controlled. Low energy modes like soft mode phonons associated with the atomic displacements that result in ferroelectricity, or spin waves in magnetically ordered systems which can be either magnetic dipole active, in the case of the magnons, or electric dipole active in the case of electromagnons can be controlled using THz pulses. The interesting thing about multiferroics is that these modes can potentially be used for ultrafast magnetoelectric control. In common ferroics and multiferroics these modes often overlap well with the spectra of typical ultrashort THz pulses. In this work we exploit that unique feature of Terahertz ultrashort pulses to report on the multiferroic domain characterization of Bismuth Ferrite and Lead Iron Niobate correlating its ferroic behaviors, enhanced or reduced,with its varying doping concentration in the terahertz regime.The material properties like index of refraction and absorption coefficient thus derived using optical interferometry can be further explored for ultrafast device configuration.
Moumita Dutta, Xomalin G. Peralta, Amar S. Bhalla, and Ruyan Guo, "Multiferroic thin film characterization probed by terahertz transient pulses
(Conference Presentation)," Proc. SPIE 9958, Photonic Fiber and Crystal Devices: Advances in Materials and Innovations in Device Applications X, 99580B (Presented at SPIE Optical Engineering + Applications: August 28, 2016; Published: 2 November 2016); https://doi.org/10.1117/12.2238174.5170791544001.
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Study of self-shadowing effect as a simple means to realize nanostructured thin films and layers with special attentions to birefringent obliquely deposited thin films and photo-luminescent porous silicon