Light-Pipes: Controlling Light
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In 2016 we added a new module to the FUSE activity lineups called "Light-Pipes: Controlling Light", in which attendees learn how to control light and use it to send messages. Students complete the "Jello Waveguide Challenge" by cutting up gelatin blocks to get their laser to turn around 180°.
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What is a Light-Pipe and Why Do We Want To Control Light?
Light usually goes in a straight line, but we can control where it goes using reflections. We can use multiple reflections to send the light back and forth, controlling its direction. Any structure which bounces light back and forth is called a light-pipe! Below you can see a large light pipe (a glass tank full of water) and a small light pipe (a glass fiber). The glass fiber is much smaller, and it can guide the light just like the tank of water! Since the fiber is compact and can be easily shaped, it is the standard "light-pipe" that is used all over the world.
Now that we can build light-pipes and control the direction of light, what can we do with light? We can send a signal down the pipe! All our data (internet, TV etc.) is sent this way, by light pulses in optical fibers.
Now that we can build light-pipes and control the direction of light, what can we do with light? We can send a signal down the pipe! All our data (internet, TV etc.) is sent this way, by light pulses in optical fibers.
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Instructions for Light-Pipe Demos: Learn More!
The files below were developed by the Photonic Society Outreach team. They provide instructions for leading a series of short demos to teach about reflections and light-pipes. They also include a demo to make a light-pipe (waveguide) out of jello!
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