Lecture

Optomechanically induced transparency

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Description

This lecture covers Optomechanically Induced Transparency (OMIT), a method to control light transmission in optomechanical systems. It explores the analogy with Electromagnetically Induced Transparency, discussing applications like optical switching, slow light, and pulse storage. The presentation delves into the dark state explanation of EIT, the full treatment with input-output theory, and experimental demonstrations. It also examines the comparison between EIT and OMIT, the concept of slow light, and controlling light with light at low power, concluding with the potential benefits of OMIT for ultralow light level switching, pulse delay, and light storage.

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Speed of light

The speed of light in vacuum, commonly denoted c, is a universal physical constant that is exactly equal to ). According to the special theory of relativity, c is the upper limit for the speed at which conventional matter or energy (and thus any signal carrying information) can travel through space. All forms of electromagnetic radiation, including visible light, travel at the speed of light. For many practical purposes, light and other electromagnetic waves will appear to propagate instantaneously, but for long distances and very sensitive measurements, their finite speed has noticeable effects.

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Light or visible light is electromagnetic radiation that can be perceived by the human eye. Visible light is usually defined as having wavelengths in the range of 400–700 nanometres (nm), corresponding to frequencies of 750–420 terahertz, between the infrared (with longer wavelengths) and the ultraviolet (with shorter wavelengths). In physics, the term "light" may refer more broadly to electromagnetic radiation of any wavelength, whether visible or not. In this sense, gamma rays, X-rays, microwaves and radio waves are also light.

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