Terahertz metasurface biosensor based on Fano resonance, and preparation method thereof

A biosensor and metasurface technology, applied in the field of terahertz biosensors, can solve problems affecting biosensing applications and achieve simple and convenient measurement, small size, and enhanced sensitivity

Pending Publication Date: 2020-10-13
NANCHANG UNIV +1
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Problems solved by technology

However, due to the relatively long wavelength of terahertz waves, it is...

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  • Terahertz metasurface biosensor based on Fano resonance, and preparation method thereof
  • Terahertz metasurface biosensor based on Fano resonance, and preparation method thereof
  • Terahertz metasurface biosensor based on Fano resonance, and preparation method thereof

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Embodiment Construction

[0023] Such as figure 1 As shown, a Fano resonance-based terahertz metasurface biosensor and its preparation method is characterized in that it includes a substrate 1 made of ultra-thin flexible polyimide film, and periodically attaches several substrates on the surface of the substrate. A unit structure, the unit structure is made of two metal split rings 2 with overlapping openings, the outer diameter R=50 μm of the metal split ring 2 in the unit structure, the inner diameter r=40 μm, the width is 10 μm, and the thickness is 200 nm. The central angles of the metal split ring 2 are respectively θ 1 = 140° and θ 2 =160°, the unit cell period of a single unit structure is P=120 μm, that is, the size of a single unit structure is a square with a side length of 120 μm, the center of the metal split ring 2 coincides with the center point of the unit structure, and the substrate 1 The thickness is 25 μm, and the length and width of the substrate are 1.5 cm×1.5 cm, respectively. ...

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Abstract

The invention provides a terahertz metasurface biosensor based on Fano resonance, and a preparation method thereof. An ultrathin flexible polyimide film is used as a substrate of the sensor, and a periodically arranged metal asymmetric split ring structure is prepared on the upper surface of the sensor. When a line-bias terahertz wave of which the electric field vibration direction is parallel tothe structure opening direction is vertically incident, the Fano resonance effect can be excited, and a sharp asymmetric transmission spectrum line type is generated. Based on the metasurface design of Fano resonance, the ultrathin polyimide with low dielectric constant and low loss is used as the substrate, so that the detection sensitivity can be further improved, and the trace detection is realized. The terahertz metasurface biosensor has the advantages of low preparation cost, good ductility, small size, simple and convenient measurement and the like, and can be widely applied to terahertzwave spectrum biosensing.

Description

technical field [0001] The invention relates to a terahertz biosensor for unlabeled biological protein detection, in particular to a Fano resonance-based terahertz supersurface biosensor and a preparation method thereof. Background technique [0002] The terahertz (THz) frequency band is the part of the electromagnetic spectrum that lies between microwaves and infrared light waves. With the development of stable THz radiation sources and sensitive THz detectors in recent years, the research on THz waves has been greatly promoted. Terahertz waves have some unique properties in the field of biomedicine. For example, terahertz photons are very low, and there is no ionizing radiation for biological samples; they are very sensitive to weak interactions, and many biological macromolecules can achieve spectral fingerprinting in the terahertz band. However, due to the relatively long wavelength of terahertz waves, it is blind to tiny features, which seriously affects its applicatio...

Claims

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Application Information

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IPC IPC(8): G01N21/552
CPCG01N21/553
Inventor 沈云程瑞剑邓晓华邹林儿代国红
Owner NANCHANG UNIV
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