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  2. Optical microcavity - Wikipedia

    en.wikipedia.org/wiki/Optical_microcavity

    Time-resolved simulation of the dynamics of a pulse illuminating a microcavity. An optical microcavity or microresonator is a structure formed by reflecting faces on the two sides of a spacer layer or optical medium, or by wrapping a waveguide in a circular fashion to form a ring.

  3. Covert listening device - Wikipedia

    en.wikipedia.org/wiki/Covert_listening_device

    It is illegal to use listening or recording devices that are not permitted for public use. Individuals may only use listening or recording devices within reasonable privacy laws for legitimate security and safety reasons. Many people use listening devices on their own property to capture evidence of excessive noise in a neighbour complaint ...

  4. Electromagnetic reverberation chamber - Wikipedia

    en.wikipedia.org/wiki/Electromagnetic...

    A reverberation chamber is cavity resonator—usually a screened room—that is operated in the overmoded region. To understand what that means we have to investigate cavity resonators briefly. For rectangular cavities, the resonance frequencies (or eigenfrequencies , or natural frequencies ) f m n p {\displaystyle f_{mnp}} are given by

  5. Resonator - Wikipedia

    en.wikipedia.org/wiki/Resonator

    A resonator is a device or system that exhibits resonance or resonant behavior. That is, it naturally oscillates with greater amplitude at some frequencies, called resonant frequencies, than at other frequencies. The oscillations in a resonator can be either electromagnetic or mechanical (including acoustic). Resonators are used to either ...

  6. RF and microwave filter - Wikipedia

    en.wikipedia.org/wiki/RF_and_microwave_filter

    The simplest resonator structure that can be used in rf and microwave filters is an LC tank circuit consisting of parallel or series inductors and capacitors. These have the advantage of being very compact, but the low quality factor of the resonators leads to relatively poor performance.

  7. Deleting your browser history could land you in court - AOL

    www.aol.com/news/2015-06-08-deleting-your...

    Many Internet users delete their browser history and clear their cache and cookies without thinking twice about it. It's just one of those things you do — some more often than others &mdash ...

  8. The Fascinating Backstory Behind Red Dye No. 3 - AOL

    www.aol.com/fascinating-backstory-behind-red-dye...

    "Hearst Magazines and Yahoo may earn commission or revenue on some items through these links." BY NOW, YOU'VE probably seen the news about the FDA revoking authorization for the use of Red Dye No ...

  9. Nanophotonic resonator - Wikipedia

    en.wikipedia.org/wiki/Nanophotonic_resonator

    A nanophotonic resonator or nanocavity is an optical cavity which is on the order of tens to hundreds of nanometers in size. Optical cavities are a major component of all lasers , they are responsible for providing amplification of a light source via positive feedback , a process known as amplified spontaneous emission or ASE.