Method for producing terahertz super-continuous source

Abstract

The invention discloses a method for producing terahertz super-continuous source. Firstly, an oxide template of a sub-wavelength array hole structure needs to be prepared. Excited by femtosecond laser the oxide template of the sub-wavelength array hole structure produced by the method for producing the terahertz super-continuous source has great intensity in energy of terahertz radiation and enhances the energy conversion efficiency greatly, thus enabling terahertz continuum radiation source to have extensive application prospects. The method for preparing the oxide template of the sub-wavelength array hole structure is wide in choosing range of substrate materials, simple in preparation method and low in cost.

Description

technical field [0001] The invention relates to the technical field of terahertz source generation, in particular to a method for generating a terahertz supercontinuum source. Background technique [0002] Terahertz supercontinuum sources are widely used in basic natural sciences such as physics, chemistry, and biology due to their advantages such as high time resolution (femtosecond level), large energy (single pulse reaches tens of microjoule level) and wide spectrum coverage. , as well as research fields such as semiconductors, electronics and nonlinear optics have broad application prospects. [0003] In view of the fact that the existing traditional terahertz optical generation technology uses a photoconductive antenna or a nonlinear electro-optic crystal as the emitter of the terahertz wave, the electric field intensity of the radiated terahertz wave is only several kV / cm, and the energy of the terahertz wave is also low ( Single pulse energy <1nJ), terahertz optic...

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Problems solved by technology

[0004] Researchers such as M.Ashida and R.Akai in Japan published a method in Springer Series in Optical Sciences (2007,132:317-323) using a center wavelength of 800nm, a repetition rate of 80MHz, a pulse width of 5fs, and an average power of 0.2W ultra-short femtosecond optical pumping 0.4mm DAST nonlinear crystal method to generate terahertz supercontinuum; Gregor H. Welsh et al. published on PRL and OE in 2007 and 2009 respectively Structured metal grating is used as a terahertz wave source, and terahertz pulses with a bandwidth of 0.2-2.5 THz are detected by electro-optic sampling technology; although these methods can generate a terahertz supercontinuum with a bandwidth of about 100 THz by using nonlinear crystals and photoconductive antennas, they are not enough The advantage is that pumps with extremely narrow pulse width (<10fs), thinner crystals (on the order of tens of microns) or photoconductive antennas with substrate structures with longer carrier life and high carrier mobility are required. The conditions can only be realized, and the power of the generated terahertz wave is too low, only in the order of a few microwatts (the energy of a single pulse is in the order of nJ), and the cost is relatively high (the production price of nonlinear crystal is relatively high)

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