Coupling prism and optical detection system thereof
The present invention provides a prism. The prism includes a lower surface, an upper surface, a first side surface and a second side surface. The first side surface and the second side surface are disposed between the upper surface and the lower surface. The first side surface and the second side surface of the prism are one-dimensional parabolic surfaces. The lower surface is used to receive light. The first side surface is used to reflect the light from the lower surface to the upper surface. The second side surface is used to reflect the light from the upper surface to the lower surface for further analysis in the process unit afterwards.
1. A prism, comprising:
a lower surface, used to receive light;
an upper surface, opposite to the lower surface;
a first side surface, a one-dimensional parabolic surface, used to reflect the light from the lower surface to the upper surface; and
a second side surface, a one-dimensional parabolic surface, used to reflect the light from the upper surface to the lower surface;
wherein, the first side surface and the second side surface are disposed between the upper surface and the lower surface,
wherein the light is respectively reflected in the prism from the lower surface to the upper surface and vice versa by the first side surface and the second side surface,
wherein the incident angle of the light impinging onto the first side surface and then reflected to the upper surface is larger than the critical angle of the total internal reflection, and
wherein the incident angle of the light, from the upper surface, impinging onto the second side surface is larger than the critical angle of the total internal reflection.
2. The prism according to claim 1 , wherein the lower surface of the prism is parallel to the upper surface.
3. The prism according to claim 1 , wherein the lower surface of the prism is not parallel to the upper surface.
4. An optical detection system, comprising:
a light source unit, used to provide light;
a prism, comprising:
a lower surface, used to receive the light;
an upper surface, opposite to the lower surface;
a first side surface, a one-dimensional parabolic surface, used to reflect the light from the lower surface to the upper surface; and
a second side surface, a one-dimensional parabolic surface, used to reflect the light from the upper surface to the lower surface;
wherein, the first side surface and the second side surface are disposed between the upper surface and the lower surface,
wherein the light is respectively reflected in the prism from the lower surface to the upper surface and vice versa by the first side surface and the second side surface,
wherein the incident angle of the light impinging onto the first side surface and reflected to the upper surface is larger than the critical angle of the total internal reflection, and
wherein the incident angle of the light, from the upper surface, impinging onto the second side surface is larger than the critical angle of the total internal reflection; and
a detection unit, detecting the light coming from the control unit to output a signal.
5. The optical detection system according to claim 4 , wherein the control unit further comprises a triangle mirror, having a first reflection side and a second reflection side, in which the first reflection side is used to receive light from the light source unit and direct the light into the lower surface of the prism; the second reflection side is used to receive light from the lower surface and direct the light into the detection unit.
6. The optical detection system according to claim 5 , wherein the control unit further comprises a first stage motion controller connected to the triangle mirror.
7. The optical detection system according to claim 6 , wherein the triangle mirror is located at a motorized translation stage.
8. The optical detection system according to claim 6 , wherein the control unit further comprises a second stage motion controller connected to the prism.
9. The optical detection system according to claim 8 , wherein the prism is located at a motorized translation stage.
10. The optical detection system according to claim 8 , wherein the control unit further comprises a control element electrically connected to the first stage motion controller and the second stage motion controller.
11. The optical detection system according to claim 4 , wherein the detection unit comprises a non-polarizing beam splitter, a polarizing beam splitter, an amplifier, a wave plate and at least a detection element.
12. The optical detection system according to claim 11 , wherein the detection element is a photodiode, a CCD image sensor or a CMOS image sensor.
13. The optical detection system according to claim 4 , wherein further comprises a process unit to receive and process signals.
14. The optical detection system according to claim 4 , wherein when a microfluidic substrate slide is attached on the prism, the prism then should be peeled off by the thickness of the microfluidic substrate slide.