Method for capturing biological sample based on continuous domain quasi bound state terahertz metasurface tweezers
A biological sample and metasurface technology, applied in the field of terahertz spectroscopy, can solve the problem of low electric field localization of terahertz wave devices, and achieve the effect of improving non-destructive capture and manipulation capabilities and high electric field enhancement
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Embodiment 1
[0074] see figure 2 , is the unit geometry model of Example 1, which consists of two vertical bars and a cuboid base. All components are made of silicon with a dielectric constant of 11.9, which is the smallest unit and is periodically arrayed in the plane, that is, obtain a quasi-bound state-enhanced terahertz metasurface tweezers (see image 3 ), in practice, at least the area of the metasurface tweezers needs to be larger than the area of the terahertz spot (2 square millimeters), and considering the processing problem, the number of arrays is 15*15~50*50.
[0075]The geometrical dimensions of the terahertz metasurface tweezers ranged from P=85-95 μm, H=35-50 μm, W=30-35 μm, L=50 μm, ΔL=-30-30 μm. The CST Studio Suite electromagnetic simulation software is used to calculate the reflection spectrum of the incident electromagnetic wave in the range of 1.095 to 1.115 THz, the polarization direction of the incident electromagnetic wave is parallel to the vertical direction...
Embodiment 2
[0082] see Figure 7 , is a schematic diagram of the unit structure of Example 2, which is shaped like a hole-digging square, and the composition material is gold; the geometric dimensions are in the order of P=240~260μm, H=20~25μm, S=140~160μm, W=40~ 50μm, L=35~45μm, ΔY=-50~50μm.
[0083] see Figure 8 , Figure 8 Absorption spectrum contour plots are shown for frequencies ranging from 2.9 to 2.935 THz and ΔY from -50 to 50 μm.
[0084] see Figure 9 , and its corresponding Q value, when ΔY=0 is an obvious bound state excitation point.
[0085] Preferably, the dimensions P=250 μm, H=20 μm, S=150 μm, W=44 μm, L=40 μm, and ΔY=30 μm are used as the terahertz metasurface tweezers of Example 2.
[0086] see Figure 10 , for the preferred quasi-bound state terahertz metasurface tweezers (ΔY = 30 μm), when the resonant frequency is 2.9221 terahertz, the electric field forms a relatively high electric field around the rectangle and inside the square hole, especially at the corn...
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