Disk structure, manufacturing method thereof and optical tweezers device using the same
A disk structure is disposed in an optical tweezers device including a light source for producing incident laser light. The disk structure includes a first substrate, a second substrate and a reflective layer. The second substrate is disposed with respect to the first substrate. One of the first substrate and the second substrate has at least one flow path. The reflective layer, which is adhered to the second substrate, is disposed between the first substrate and the second substrate. After the incident laser light passes through the first substrate and then reaches the reflective layer, the incident laser light is reflected back as reflective laser light by the reflective layer to form reflective laser light. A tweezers light field is formed in the flow path by both the reflective laser light and the incident laser light.
1. An optical tweezers device, comprising:
a light source for producing incident laser light;
a disk structure, comprising:
a first substrate;
a second substrate disposed with respect to the first substrate, wherein one of the first substrate and the second substrate has at least one flow path; and
a reflective layer, which is adhered to the second substrate, disposed between the first substrate and the second substrate; and
a focusing lens disposed at a side of the first substrate, wherein after the incident laser light sequentially passes through the focusing lens and the first substrate and then reaches the reflective layer, the incident laser light is reflected back as reflective laser light by the reflective layer and a tweezers light field is formed in the flow path by both the incident laser light and the reflective laser light.
2. The optical tweezers device according to claim 1 , wherein the focusing lens is a zoom lens.
3. The optical tweezers device according to claim 2 , wherein the zoom lens is a liquid lens.
4. The optical tweezers device according to claim 2 , wherein the zoom lens and the disk structure are capable of moving with respect to each other.
5. The optical tweezers device according to claim 1 , wherein the disk structure further comprises:
an adhesive layer disposed between the first substrate and the reflective layer.
6. The optical tweezers device according to claim 5 , wherein the adhesive layer is disposed between the first substrate and the reflective layer by spin coating.
7. The optical tweezers device according to claim 5 , wherein the adhesive layer is made of anti-electrostatic transparent adhesive.
8. The optical tweezers device according to claim 1 , wherein the reflective layer is made of silver, aluminum, copper or alloy.
9. The optical tweezers device according to claim 1 , wherein the first substrate is a transparent substrate.
10. The optical tweezers device according to claim 1 , wherein the reflective layer is disposed on the second substrate by sputtering or vaporization deposition.
11. The optical tweezers device according to claim 1 , wherein the disk structure further comprises:
a protective layer disposed between the first substrate and the reflective layer and covering the reflective layer.
12. The optical tweezers device according to claim 11 , wherein the protective layer is disposed between the first substrate and the reflective layer by sputtering or vaporization deposition.
13. The optical tweezers device according to claim 11 , wherein the protective layer is made of indium tin oxide.