Single-layer micro-nano structure with adjustable asymmetric transmission signals and preparation method thereof

Abstract

The invention belongs to the technical field of optical characteristic adjustment and control, and particularly relates to a single-layer micro-nano structure with adjustable asymmetric transmission signals and a preparation method thereof. The single-layer micro-nano structure with the adjustable asymmetric transmission signals comprises a base layer, an absorption layer, a dielectric layer and aTCO thin film layer; the two sides of a second rectangular strip are respectively provided with a fourth rectangular strip and a fifth rectangular strip which are symmetric with each other, the second rectangular strip and a third rectangular strip are respectively connected with a first electrode and a second electrode which are used for being connected with an external circuit to change an electric field, the electric field between the second rectangular strip and the third rectangular strip is changed, the dielectric environment of TCO thin film at the right side of the second rectangularstrip is changed, the two sides of the second rectangular strip have the same or different refractive indexes, and therefore the purpose of adjusting the AT signals is achieved. The single-layer micro-nano structure is simple and convenient to adjust and has high application and popularization value.

Description

technical field [0001] The invention belongs to the technical field of optical characteristic regulation, and in particular relates to a single-layer micro-nano structure with adjustable asymmetric transmission signals and a preparation method thereof. Background technique [0002] Asymmetric transmission (Asymmetric Transmission, AT) refers to the effect that electromagnetic waves with different polarization states show different transmission properties after entering the structure. Among them, transmission performance is mainly studied for transmission, absorption, reflection, etc. In the field of biomolecules, chiral molecules are generally weak, and artificial micro-nano metal structures can greatly improve their chirality. AT is particularly important as a detection signal for chiral molecules, so we are designing this asymmetric transmission structure When , it is necessary to achieve a strong asymmetric transmission effect, that is, a large AT value and as many AT sig...

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Problems solved by technology

[0004] In order to solve the problem that the asymmetric transmission mode of the micro-nano structure is fixed and cannot be adjusted in the prior art, the embodiment of the present application provides a single-layer micro-nano structure with an adjustable asymmetric transmission signal and its preparation method. Embodiment The micro-nano structure includes a base layer, an absorption layer, a dielectric layer and a TCO thin film layer, the thickness of the absorption layer is greater than the sum of the thickness of the dielectric layer and the TCO thin film layer, and the second rectangular strip and the third rectangular strip are connected with the first electrode and the third rectangular strip respectively. The second electrode is used to connect the external circuit. By adjusting the voltage of the external circuit, the dielectric environment of the TCO film on the right side of the second rectangular strip is changed, so that the TCO film on both sides of the second rectangular strip has different refractive indices for the incident light, and an asymmetric Dielectric environment, generate AT signal, by adjusting the size and direction of the external circuit voltage so that the two sides of the second rectangular strip have the same or different refractive index, finally achieve the purpose of adjusting the AT signal

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