Analysis of Enhanced Second-Harmonic Generation in Periodic Nanostructures using Modified Rigorous Coupled-Wave Analysis in the Undepleted-Pump Approximation
Abstract
The authors present an extension of the rigorous coupled-wave analysis (RCWA) technique to analyze second-harmonic generation (SHG) in periodic optical nanostructures in the undepleted-pump approximation. They apply this method to analyze SHG in two example nanostructures for which they predict enhanced nonlinearity due to transverse near-field localization of the fundamental optical field in the nonlinear material. First, they examine a periodic nanostructure that yields up to twice the transmitted SHG intensity output compared with the bulk nonlinear material, but only for small nanostructure depths because of mismatch of the fundamental and second-harmonic mode phase velocities. Second, they develop and analyze a modified nanostructure and find that this nanostructure concurrently achieves transverse localization and phase matching for SHG. In principle, this permits an arbitrary coherent interaction length, and for several specific nanostructure depths they predict a transmitted SHG intensity output more than two orders of magnitude greater than that of the bulk material.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 01, 2002
- Accession Number
- ADA471677
Entities
People
- Rong-chung Tyan
- Wataru Nakagawa
- Yeshaiahu Fainman
Organizations
- University of California, San Diego