Patent ID: 7898730

Claim:
A method for second harmonic generation, comprising the steps of: (a) providing a BaTiO 3 (BTO) waveguide, wherein the BTO waveguide has a substrate, a nano-dimensioned BTO film on said substrate, and a ridge component on said BTO film, and wherein said BTO film defines a plane and has a first surface and a second, opposite surface; and (b) exposing the BTO waveguide to an incident photon beam with a wavelength and a focal point such that the focal point of the incident photon beam is substantially on said BTO film and the incident photon beam is incident to the plane of said BTO film with an angle θ that is formed between the incident beam and the plane of said BTO film and satisfies the condition of 0<θ<90, wherein an output photon beam with second harmonic generation is generated, and wherein the focal point of the incident photon beam is located on the first surface of said BTO film or between the first surface and the second surface of said BTO film.