I am trying to build an optical logic circuit using the horizontal or vertical orientations of light as the two binary states and laser as the source. Before I ask you my question I wanted to first share how I designed the NOT Gate. enter image description here

NOT Gate To explain the working let's assume I send in a horizontally oriented beam of light. This beam splits into two beams. Because it is horizontally oriented, the first split beam won't enter the V Polarizer and gets blocked. The second split beam enters the H Polarizer and consequently gets vertically oriented at the end and the lower ldr detects the light, notifying us that it is now in V state.

My Problem Now, I am not able to figure out another combination of polarizers for AND and OR Gate. Can anyone help me in giving me a lead?

  • $\begingroup$ You don't even say what the logical 0 and 1 are. How should one answer the question? $\endgroup$ – Norbert Schuch Aug 14 at 17:28
  • $\begingroup$ I have mentioned that in the second and third line. Read properly. $\endgroup$ – Bhavesh Aug 15 at 18:14
  • $\begingroup$ I see. (Note that "second and third line" depends on the screen!). But then, why don't you just use a lambda/2 plate for the not gate? Your setup seems unnecessarily complicated! $\endgroup$ – Norbert Schuch Aug 15 at 18:38
  • $\begingroup$ I don't have access to wave plates, only linear polarizers $\endgroup$ – Bhavesh Aug 16 at 14:28

You’ll need the state of one beam to affect the state of another. This is a nonlinear effect requiring a potentially complex arrangement of optics and materials to make it efficient enough to be practical. First, read about nonlinear optics, then try looking up all-optical switches, for example. You won’t be able to do it with a few polarizers since they are linear optical elements.

Also, you can improve your NOT gate by switching your design with a single half-waveplate oriented at 45$^\circ$. This new design would be 100% efficient.


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