Abstract
The broad, multi-terahertz spectral window ranging from 10 to 100 THz (1 THz = 1 · 10 Hz) contains a plethora of fundamental excitations in solid state systems, including plasmons, phonons, magnons and interlevel transitions in excitons [1]. Field-resolved detection of phase-stable multi-terahertz probe pulses by electro-optic sampling (EOS) provides a direct measure of the polarization response of such phenomena. It thus reveals their evolution with a temporal resolution much faster than a single oscillation cycle of the multi-terahertz probe [2]. However, the diffraction limit restricts the spatial resolution of conventional, far-field multi-terahertz spectroscopy to half the probe wavelength (µm - mm). Consequently, in ensembles of nano-sized objects like nanowires or quantum dots, the measured dielectric function is averaged and important information can be obscured completely. Yet, accessing the optical properties of these nanostructures is crucial for understanding how their properties differ from those of a bulk material. Scattering-type near-field scanning optical microscopy (s-NSOM) can be used to overcome the diffraction limit [3].
© 2015 IEEE
PDF ArticleMore Like This
M. Eisele, T. L. Cocker, M. Huber, L. Viti, L. Sorba, M. S. Vitiello, and R. Huber
FTh4K.3 CLEO: QELS_Fundamental Science (CLEO:FS) 2014
Angela Pizzuto, Enrique Castro-Camus, William Wilson, Wonsik Choi, Xiuling Li, and Daniel M. Mittleman
SW5G.2 CLEO: Science and Innovations (CLEO:S&I) 2022
M. Eisele, T. L. Cocker, M. A. Huber, M. Plankl, L. Viti, D. Ercolani, L. Sorba, M. S. Vitiello, and R. Huber
UW1A.4 International Conference on Ultrafast Phenomena (UP) 2016