Continuously tunable degradable terahertz metamaterial based on light drive and its preparation method

Abstract

The invention provides a continuously adjustable degradable terahertz meta-material based on optical driving and preparation method thereof. The degradable terahertz meta-material comprises a sodium alginate substrate, a metal layer and a semiconductor film which are arranged on the sodium alginate substrate; the patterns of the metal layer and the semiconductor film are completely same: three equally spaced openings are formed on the outer ring, two equally spaced openings are formed on the middle ring, and one opening is formed on the inner ring; one of the three openings on the outer ring is aligned with one opening on the middle ring, and the other opening on the middle ring is aligned with the opening on the inner ring. Since the concentrations of carriers produced by the semiconductor film under different optical power excitations are different, the continuous tuning on the electromagnetically responded resonance strength from different conductivities is realized. The meta-material provided by the invention is simple in structure and processing technique, has degradable property and can be used for biomolecule detection, so that the incident electromagnetic wave of the terahertz meta-material has a plurality of frequency bands with continuously tuned strength in the terahertz waveband transmission.

Description

technical field [0001] The present invention relates to a device of micro-nano processing technology, in particular to a continuously adjustable degradable terahertz metamaterial based on optical drive and a preparation method thereof. Background technique [0002] Terahertz waves refer to electromagnetic waves with a frequency in the range of 0.1 to 10 THz, with a corresponding wavelength of 3 mm to 30 μm, and its band is located between microwave and infrared waves in the electromagnetic spectrum. The frequency response of matter in the THz band contains rich physical, chemical and biological information. Terahertz waves have the characteristics of low energy, wide bandwidth, and strong penetrability, and have important applications in the fields of communication, biomedicine, detection imaging, and nondestructive testing. However, since the long-wave microwave direction mainly relies on electronic technology, and the short-wave infrared wave direction mainly relies on op...

AI Technical Summary

Problems solved by technology

However, since the long-wave microwave direction mainly relies on electronic technology, and the short-wave infrared wave direction mainly relies on optical technology, the problem of the THz wave source between the two waves has not been well resolved, which has become a limitation of modern THz wave technology. one of the most important factors in the development

However, different dielectric layers need to be changed to obtain frequency bands in different frequency ranges, and continuous tuning of the resonance frequency cannot be performed.

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