Angularly and spectrally selective detector and light source systems
A detector system is described that includes a detector that is sensitive to wavelengths in a detection wavelength range. The detector system further includes a light control film that is disposed on the detector and includes a plurality of alternating first and second regions. Each first region has a width W and a height H, where H/W≥1. Each first region has a substantially low transmission in a first portion of the detection wavelength range and a substantially high transmission in the remaining portion of the detection wavelength range. Each second region has a substantially high transmission in the detection wavelength range.
1. A detector system, comprising:
a detector sensitive to wavelengths in a detection wavelength range; and
a light control film disposed on the detector and comprising a plurality of alternating first and second regions, each first region having a width W and a height H, H/W≥1, each first region having a substantially low transmission in a first portion of the detection wavelength range and a substantially high transmission in a remaining portion of the detection wavelength range, each second region having a substantially high transmission in the detection wavelength range.
2. The detector system of claim 1 , wherein the detection wavelength range is from about 800 nm to about 1600 nm and the first portion of the detection wavelength range is from about 900 nm to about 1100 nm.
3. The detector system of claim 1 , wherein a viewing angle of the light control film in the first portion of the detection wavelength range is less than about 70 degrees along a first direction.
4. The detector system of claim 1 , wherein the light control film comprises a major microstructured first surface having a plurality of alternating ribs and channels, each channel at least partially filled with a first material to form one of the first regions, each rib comprising a second material and forming one of the second regions.
5. The detector system of claim 1 , wherein H/W≥5.
6. The detector system of claim 1 , wherein H/W≥10.
7. The detector system of claim 1 , wherein the detector comprises a photovoltaic device.
8. The detector system of claim 1 , wherein the detector comprises a solar battery, a solar cell, or a solar detector.
9. The detector system of claim 1 , wherein the detector is a detector in a camera.
10. A camera comprising the detector system of claim 1 .