Inclined U-shaped chiral structure and preparation method thereof

Abstract

The invention relates to an inclined U-shaped chiral structure and a preparation method thereof, in particular to the field of micro-nano photonics structures. The structure comprises a substrate anda plurality of chiral units periodically arranged on the substrate, each chiral unit comprises a first rectangular strip, a second rectangular strip, a third rectangular strip and a protruding part, the first rectangular strip, the second rectangular strip and the third rectangular strip form a U-shaped structure, and the protruding part is arranged on the side, away from the substrate, of the third rectangular strip. Under the excitation of incident circular polarized light, a combined dipole is formed on the protruding part and the third rectangular strip, and due to the fact that the dipoleis not parallel to the oscillation path of the dipole on the first rectangular strip and the oscillation path of the dipole on the second rectangular strip, the phase difference between structures iscaused, the phase difference between the dipoles of the structure can be changed by flexibly controlling the thickness and the shape of the protruding part, so that a flexible and controllable chiralsignal is generated, and a new mechanism is provided for the generation of the chiral signal.

Description

technical field [0001] The invention relates to the field of micro-nano photonics structures, in particular to a tilted U-shaped chiral structure and a preparation method thereof. Background technique [0002] The word chirality is derived from Greek and means the symmetry of structure, which has important meaning in many disciplines. An object is said to be "chiral" if it is different from its mirror image, and its mirror image cannot be superimposed on the original object, just as the left and right hands are mirror images of each other and cannot be superimposed. Chirality is the basic characteristic of life process, and most of the organic molecules that make up living organisms are chiral molecules. [0003] The chiral signals of chiral molecules in nature are generally very weak. In recent years, researchers have discovered that surface plasmons generated by chiral metal nanostructures can be used to enhance chiral signals. Because the helical structure can generate...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a tilted U-shaped chiral structure and its preparation method for the deficiencies in the above-mentioned prior art, so as to solve the complex three-dimensional chiral nanostructure in the prior art and produce chirality. The mechanism of the signal is complex, and its preparation often requires multiple electron beam etching, the process is complicated, and the input cost is high

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