All-dielectric metasurfaces exhibit high damage thresholds and strong enhancement of the driving field, making them attractive platforms to Terahertz generation at the nanoscale. Here we report terahertz electric field from lithium niobate metasurface is enhanced by more than one order of magnitude compared to unpatterned samples. The enhanced terahertz are highly anisotropic with respect to the excitation polarization and are selective by the excitation wavelength due to its resonant features. By combining nanofabrication technology and ultrafast optics, our work paves the way for the design of new compact terahertz photonic devices that operate under high intensities and at short wavelengths.
We present an enhanced scheme of polarization-sensitive THz-ABCD which can provide about twice broader
bandwidth than the conventional method. In our experiment using a 26 fs laser pulse, compared with 0.3~40 THz in the
conventional scheme, bandwidth coverage from 0.3 to 80 THz has been achieved in the resolution-enhanced scheme. It
also should have to be noted the terahertz source may also restrict the detection bandwidth. Employing the polarizationsensitive
technology, the polarization in time domain, as well as the field amplitude, can be achieved with just one single
scan.
We have generated a narrow line-width T-ray continuously tunable in the range of 0.5~4 THz by the different frequency
generation in a GaSe crystal with a collinear phase-matched configuration. The peak power at 3.07 THz reaches 17.3 W,
and the measured line width is less than 0.3cm-1.
Conference Committee Involvement (4)
Infrared, Millimeter-Wave, and Terahertz Technologies XI
13 October 2024 | Nantong, Jiangsu, China
Infrared, Millimeter-Wave, and Terahertz Technologies X
15 October 2023 | Beijing, China
Infrared, Millimeter-Wave, and Terahertz Technologies IX
5 December 2022 | Online Only, China
Infrared, Millimeter-Wave, and Terahertz Technologies VIII
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