Method for enhancing even-order higher harmonics of two-dimensional material

• Main Authors: WU CHUNCHUN, HONG HAO, LIU KAIHUI
• Format: Patent
• Language: Chinese; English
• Published: 16.07.2021
• Subjects: ADHESIVES; CHEMISTRY; COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSESC01D OR C01F; COMPOUNDS THEREOF; DYES; INORGANIC CHEMISTRY; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES; MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FORELSEWHERE; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; METALLURGY; MISCELLANEOUS APPLICATIONS OF MATERIALS; MISCELLANEOUS COMPOSITIONS; NANOTECHNOLOGY; NATURAL RESINS; NON-METALLIC ELEMENTS; PAINTS; PERFORMING OPERATIONS; POLISHES; SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; TRANSPORTING

The invention provides a method for enhancing even-order higher harmonics of a two-dimensional material, and belongs to the technical field of optical signal enhancement. The method comprises the following steps: 1) preparing a two-dimensional material, and measuring a second harmonic spectrum or a fourth harmonic spectrum of the two-dimensional material; 2) coating a quantum dot film on the two-dimensional material; and 3) selecting the two-photon absorption wavelength of the quantum dots to resonate with the light-emitting wavelength of a laser. The strength of even-order higher harmonics of the two-dimensional material is enhanced. Through a QD coating method, the nonlinear optical response of the two-dimensional material is greatly improved. 本发明提供一种增强二维材料的偶数阶高次谐波的方法，属于光信号增强技术领域。该方法包括：1)制备二维材料，并测定二维材料的二次谐波光谱或四次谐波光谱；2)在二维材料上涂覆量子点薄膜；3)选择量子点的双光子吸收波长与激光器的发光波长共振；实现增强二维材料的偶数阶高次谐波的强度。本发明通过QD涂层方法大大提高了二维材料的非线性光学响应。