Transparent wood surface imprinting optical device and application thereof

1 . A preparation method for a transparent wood surface imprinting optical device, comprising: preparation of transparent wood and preparation of target structure transparent wood;

wherein the preparation of transparent wood comprises:

taking balsa wood as a raw material, and cutting the balsa wood into a wood veneer;

using sodium chlorite to prepare a bleaching solution with a mass fraction in a range of 0.5% to 1.5%;

adjusting, by using one of glacial acetic acid/acetic acid buffer solution, a potential of hydrogen (pH) value of the bleaching solution to be in a range of 4.5 to 4.7;

immersing the balsa wood veneer in the bleaching solution and cooking the balsa wood veneer at a temperature in a range of 75 Celsius degrees (° C.) to 85° C. to obtain delignified porous wood;

prepolymerizing methyl methacrylate (MMA) by using 2,2′-azobisisobutyronitrile as an initiator at a temperature in a range of 70° C. to 80° C. for 15 minutes, to obtain prepolymerized MMA;

placing the prepolymerized MMA in ice water to cool the prepolymerized MMA to an ambient temperature, and then adding the prepolymerized MMA into the delignified porous wood;

impregnating the delignified porous wood filled by the prepolymerized MMA with a solution under a vacuum pressure in a range of −0.09 megapascals (MPa) to −0.08 MPa;

wrapping the delignified porous wood between two layers of glass slides with aluminum foil, and drying and curing the delignified porous wood; and

taking out the delignified porous wood from the two layers of glass slides to obtain the transparent wood;

wherein the preparation of target structure transparent wood comprises:

cleaning and drying a surface of the transparent wood;

spin-coating polymethyl methacrylate (PMMA) on a substrate of the transparent wood to obtain a PMMA layer;

spin-coating an ultraviolet (UV) glue on the PMMA layer to obtain a UV glue layer and thereby obtaining PMMA and UV glue coated transparent wood; and

placing the PMMA and UV glue coated transparent wood on a P-doped (100) n-type silicon wafer with a resistivity in a range of 1 ohm per centimeter (Ω/cm) to 10 Ω/cm, attaching a target template on the UV glue layer, exposing the UV glue layer, and removing the target template after the exposing to obtain target structure transparent wood;

wherein the P-doped (100) n-type silicon wafer is configured to ensure that the PMMA and UV glue coated transparent wood is evenly imprinted by the target template;

wherein the target template is one of a transparent grating array imprinting template and a lattice structure imprinting template; and

wherein in a situation that the target template is the transparent grating array imprinting template, the target structure transparent wood is grating-structure-based transparent wood, and in a situation that the target template is the lattice structure imprinting template, the target structure transparent wood is lattice-structure-based transparent wood.

2 . A preparation method for a transparent wood surface imprinting optical device comprises:

cleaning and drying a surface of transparent wood;

spin-coating PMMA on a substrate of the transparent wood to obtain a PMMA layer;

spin-coating a UV glue on the PMMA layer to obtain a UV glue layer and thereby obtaining PMMA and UV glue coated transparent wood; and

placing the PMMA and UV glue coated transparent wood on a P-doped (100) n-type silicon wafer with a resistivity in a range of 1 Ω/cm to 10 Ω/cm, attaching a target template on the UV glue layer, exposing the UV glue layer, and removing the target template after the exposing to obtain target structure transparent wood;

wherein the P-doped (100) n-type silicon wafer is configured to ensure that the PMMA and UV glue coated transparent wood is evenly imprinted by the target template;

wherein the target template is one of a transparent grating array imprinting template and a lattice structure imprinting template; and

wherein in a situation that the target template is the transparent grating array imprinting template, the target structure transparent wood is grating-structure-based transparent wood, and in a situation that the target template is the lattice structure imprinting template, the target structure transparent wood is lattice-structure-based transparent wood.

3 . The preparation method for the transparent wood surface imprinting optical device as claimed in claim 2 , further comprising:

step 1, taking balsa wood as a raw material, and performing delignification on the balsa wood to prepare delignified porous wood; and

step 2, performing vacuum-repeated impregnation on the delignified porous wood to obtain the transparent wood.

4 . The preparation method for the transparent wood surface imprinting optical device as claimed in claim 3 , wherein in the step 1, the performing delignification comprises:

cutting the balsa wood into a balsa wood veneer;

using sodium chlorite to prepare a bleaching solution with a mass fraction in a range of 0.5% to 1.5%;

adjusting, by using one of glacial acetic acid or acetic acid buffer solution, a pH value of the bleaching solution to be in a range of 4.5 to 4.7; and

immersing the balsa wood veneer in the bleaching solution and boiling cooking the balsa wood veneer at a temperature in a range of 75° C. to 85° C. to obtain the delignified porous wood.

5 . The preparation method for the transparent wood surface imprinting optical device as claimed in claim 4 , wherein in the step 2, the vacuum-repeated impregnation comprises:

prepolymerizing MMA by using 2,2′-azobisisobutyronitrile as an initiator at a temperature in a range of 70° C. to 80° C. for 15 minutes, to obtain prepolymerized MMA;

placing the prepolymerized MMA in ice water to cool the prepolymerized MMA to an ambient temperature, and then adding the prepolymerized MMA into the delignified porous wood;

impregnating the delignified porous wood filled by the prepolymerized MMA with a solution under a vacuum pressure in a range of −0.09 MPa to −0.08 MPa;

wrapping the delignified porous wood between two layers of glass slides with aluminum foil, and drying and curing the delignified porous wood; and

taking out the delignified porous wood from the two layers of glass slides to obtain the transparent wood.