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2. Photoelectric sensor - Wikipedia

   en.wikipedia.org/wiki/Photoelectric_sensor

   Conceptual through-beam system to detect unauthorized access to a secure door. If the beam is interrupted, the detector triggers an alarm. A photoelectric sensor is a device used to determine the distance, absence, or presence of an object by using a light transmitter, often infrared, and a photoelectric receiver.

3. Photo-reflectance - Wikipedia

   en.wikipedia.org/wiki/Photo-reflectance

   Photo-reflectance is an optical technique for investigating the material and electronic properties of thin films.Photo-reflectance measures the change in reflectivity of a sample in response to the application of an amplitude modulated light beam.

4. Photodetector - Wikipedia

   en.wikipedia.org/wiki/Photodetector

   A photodetector salvaged from a CD-ROM drive.The photodetector contains three photodiodes, visible in the photo (in center).. Photodetectors, also called photosensors, are sensors of light or other electromagnetic radiation. [1]

5. Photodiode - Wikipedia

   en.wikipedia.org/wiki/Photodiode

   Either type of photosensor may be used for light measurement, as in camera light meters, or to respond to light levels, as in switching on street lighting after dark. Photosensors of all types may be used to respond to incident light or to a source of light which is part of the same circuit or system.

6. Image sensor - Wikipedia

   en.wikipedia.org/wiki/Image_sensor

   A micrograph of the corner of the photosensor array of a webcam digital camera Image sensor (upper left) on the motherboard of a Nikon Coolpix L2 6 MP. The two main types of digital image sensors are the charge-coupled device (CCD) and the active-pixel sensor (CMOS sensor), fabricated in complementary MOS (CMOS) or N-type MOS (NMOS or Live MOS) technologies.

7. Spatial light modulator - Wikipedia

   en.wikipedia.org/wiki/Spatial_light_modulator

   Spatial light modulators can be either reflective or transmissive depending on their design and purpose. [4] DMDs, short for digital micromirror devices, are spatial light modulators that specifically work with binary amplitude-only modulation. [5] [6] Each pixel on the SLM can only be in one of two states: "on" or "off". The main purpose of ...