Detection device

1. A detection device, comprising:

a light guide element having a top surface and a bottom surface opposite to the top surface;

a sensing element disposed beside the bottom surface of the light guide element;

a surface plasma resonance layer disposed on the top surface of the light guide element and adapted to receive a biopolymer; and

a spatial filter element disposed between the bottom surface of the light guide element and the sensing element, wherein the spatial filter element has a plurality of first light channels and a plurality of second light channels, the plurality of first light channels extend in a first direction, the plurality of second light channels extend in a second direction, the first direction and the second direction are intersected, a normal direction of the top surface of the light guide element and the second direction form an included angle β, and the included angle β corresponds to a resonant angle γ of the surface plasma resonance layer.

2. The detection device as recited in claim 1 , wherein the plurality of first light channels and the plurality of second light channels are alternately arranged.

3. The detection device as recited in claim 1 , wherein the normal direction of the top surface of the light guide element and the first direction form an included angle α.

4. The detection device as recited in claim 3 , wherein the included angle α and the included angle β satisfy α<β.

5. The detection device as recited in claim 1 , further comprising:

a first reflective element disposed on the bottom surface of the light guide element, wherein a light beam, after being reflected by the surface plasma resonance layer and the first reflective element, is transmitted to the sensing element.

6. The detection device as recited in claim 5 , wherein the first reflective element comprises:

a plurality of first reflective portions arranged on the bottom surface of the light guide element at intervals.

7. The detection device as recited in claim 5 , further comprising:

a second reflective element disposed on the top surface of the light guide element and spaced apart from the surface plasma resonance layer at intervals, wherein the light beam, after being reflected by the surface plasma resonance layer, the first reflective element and the second reflective element, is transmitted to the sensing element.

8. The detection device as recited in claim 5 , wherein the light beam, after being reflected by the surface plasma resonance layer, is transmitted to the first reflective element.

9. The detection device as recited in claim 1 , wherein the spatial filter element further has a plurality of third light channels and a plurality of fourth light channels, the plurality of third light channels extend in a third direction, the plurality of fourth light channels extend in a fourth direction, the third direction and the fourth direction are intersected, the normal direction of the top surface of the light guide element and the third direction form an included angle β 2 , the normal direction of the top surface of the light guide element and the fourth direction form an included angle β, and the included angle β 2 and the included angle β 3 satisfy α<β 2 , β 3 <β 3 .

10. The detection device as recited in claim 9 , wherein the first light channel, the second light channel, the third light channel and the fourth light channel are sequentially arranged on the sensing element.

11. The detection device as recited in claim 10 , wherein the included angle β 2 and the included angle β 3 satisfy α<β 2 <β 3 <β.