Optical module and optical device using same

1. An optical module comprising:

a spectral filter array including a plurality of unit spectral filters;

a band-limited filter configured to selectively transmit light of a wavelength region narrower than a wavelength region designed to be measured through the spectral filter array; and

an optical detection unit configured to detect an optical signal passing through the spectral filter array and the band-limited filter,

wherein the spectral filter array is configured to absorb light or reflect light of a specific wavelength region.

2. The optical module of claim 1 , wherein the spectral filter array is disposed between the band-limited filter and the optical detection unit.

3. The optical module of claim 1 , wherein the unit spectral filters are one of a diffraction grating filter, a prism filter, a Fabry-Perot resonance filter, a plasmonic filter having a metal nanostructure array or a metal nanohole array, a silicon nanowire-based filter, an absorption filter, a resonance waveguide resonance mode type filter, or an optical interference spectral filter using integrated optics.

4. The optical module of claim 1 , wherein the spectral filter array comprises a plurality of unit spectral filters in which metal patterns having a predetermined shape are periodically arranged.

5. The optical module of claim 1 , wherein the band-limited filter is composed of a plurality of unit band-limited filters for selectively transmitting light of different wavelength regions.

6. The optical module of claim 5 , wherein the band-limited filter comprises three to seven unit defining filters, and the optical detection unit is a CMOS image sensor.

7. The optical module of claim 5 , wherein the unit band-limited filter comprises one or a plurality of R, G, and B color filters.

8. The optical module of claim 5 , wherein the one or plurality of unit band-limited filters selectively transmit light of a certain region within 700 nm to 1100 nm.

9. The optical module of claim 1 , wherein the optical detection unit is an optical detection pixel of a CMOS image sensor or an infrared image sensor.

10. The optical module of claim 1 , wherein a size of a light detection pixel of the optical detection unit is smaller than a size of the unit spectral filter.

11. The optical module of claim 1 , further comprising a processing unit configured to perform a signal restoration function of restoring a spectrum of an incident light using an optical signal detected by the optical detection unit.

12. The optical module of claim 11 , wherein in restoring the spectrum of the light, a filter function matrix is configured by adding a set of a combination of a spectral filter and a band-limited filter in a column direction.

13. The optical module of claim 11 , wherein in the signal restoration function, a filter function matrix for signal restoration is such that a range of a wavelength sampling region is effectively limited by a band-limited filter and a matrix value out of an effective wavelength range is converged to zero.

14. An optical device comprising:

an image sensor region including a color filter layer configured to filter an incident light to at least R, G, and B, and a first light detection region configured to detect an optical signal passing through the color filter layer using a plurality of first unit pixels; and

a spectrum sensor region including a spectral filter array configured to measure a spectrum of a target object and a second light detection region configured to detect an optical signal passing through a spectral filter array through a plurality of second unit pixels; and

a band-limited filter having a wavelength region narrower than an operating wavelength bank to be measured through the spectral filter array on a path of an optical signal of the spectrum sensor region.

15. The optical device of claim 14 , further comprising a band-limited filter having a wavelength region narrower than an operating wavelength band to be measured through the spectral filter array on a path of an optical signal of the spectrum sensor region.

16. The optical device of claim 14 , wherein the spectral filter array and the band-limited filter are stacked, and the band-limited filter is disposed on the spectral filter array.

17. The optical device of claim 15 , wherein the spectral filter array and the band-limited filter are stacked, and the spectral filter array is disposed on the band-limited filter.

18. The optical device of claim 15 , wherein the band-limited filter comprises a plurality of unit band-limited filters configured to selectively transmit light of different wavelength regions.

19. The optical device of claim 18 , further comprising the unit-defining filter which includes one or a plurality of R, G, and B color filters.

20. The optical device of claim 18 , wherein the one or plurality of unit band-limited filters selectively transmit light of a certain region within 700 nm to 1100 nm.