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We demonstrate a novel method for obtaining optical constants of transparent material over a broad terahertz spectral range from 0.7 THz to 7.5 THz at room temperature. Based on the interferogram directly acquired by a Fourier transform infrared spectrometer (FTIR), multiple beam interference principle combining Fresnel's formula is employed to extract the refraction index and the extinction coefficient,...
We demonstrate the simultaneous and independent spatiotemporal control of optical fields on nanometer length and femtosecond time scales, enabled by the intrinsic adiabatic and mode-matched surface plasmon polariton nanofocusing ability of 3D tapered Au tips, in combination with femtosecond pulse shaping using MIIPS.
The precise characterization of the ultrafast electronic response in a metallic nanostructure is achieved using a combination of spectrogram measurement of collinear interferometric second-harmonic scattering and treatment of Frequency Resolved Optical Gating (FROG). The plasmon dephasing dynamics have been resolved with multiple time-scales.
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