Whispering-gallery wave known as surface plasmons has been demonstrated in the form of whispering-gallery waves, and likewise for exciton-polaritons in semiconductors. Galleries simultaneously containing both acoustic and optical whispering-gallery waves have also been made, exhibiting very strong mode coupling and coherent effects. Hybrid solid-fluid-optical whispering-gallery structures have been observed as well. Whispering-gallery wave Whispering-gallery waves, or whispering-gallery modes, are a type of wave that can travel around a concave surface. Originally discovered for sound waves in the whispering gallery of St Paul’s Cathedral, they can exist for light and for other waves, with important applications in nondestructive testing, lasing, cooling and sensing,
London Guarantee Building on April 16, 1996. The London Guarantee & Accident Building was designed by Chicago architect Alfred S. Alschuler and completed in 1923 for the London Guarantee & Accident Company, an insurance firm that was then its principal occupant. The top of the building is noted to resemble the Choragic Monument of Lysicrates in Athens, but it was modeled after the Stockholm Stadshus. It is located in the Michigan–Wacker Historic District. The building stands on the property formerly occupied by the Hoyt Building from 1872 until 1921. The LondonHouse Hotel name is an homage to the first owner of the 1923