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Whispering Gallery Microcavities Control Momentum of Light

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A method to control the momentum of broadband light using whispering gallery microcavities* (WGMs) could enable easier application of integrated photonic circuits. Optical devices typically require the coupling of light between different components. However, conservation of momentum usually limits the bandwidth of the coupling. It becomes challenging to couple the optical fields because the waves from the two fields are traveling at different speeds. Coupling the optical fields from waveguides to the optical fields in whispering galleries in photonic circuits is like trying to transfer...Read full article

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