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 reported a technology of gray-scale imaging using broadband terahertz pulse. Utilizing the spatial distribution of
different frequency content, image information can be acquired from the terahertz frequency domain analysis. Unlike
CCDs(charge-coupled devices) or spot scanning technology are used in conversional method, a single-pixels detector
with single measurement can meet the demand of our scheme. And high SNR terahertz imaging with fast velocity is
believed.
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