title: Design of an efficient terahertz source using triply resonant nonlinear photonic crystal cavities.
abstract: We propose a scheme for efficient cavity-enhanced nonlinear THz generation via difference-frequency generation (DFG) processes using a triply resonant system based on photonic crystal cavities. We show that high nonlinear overlap can be achieved by coupling a THz cavity to a doubly-resonant, dual-polarization near-infrared (e.g. telecom band) photonic-crystal nanobeam cavity, allowing the mixing of three mutually orthogonal fundamental cavity modes through a chi((2)) nonlinearity. We demonstrate through coupled-mode theory that complete depletion of the pump frequency - i.e., quantum-limited conversion - is possible. We show that the output power at the point of optimal total conversion efficiency is adjustable by varying the mode quality (Q) factors.
authors.affiliation: School of Engineering and Applied Sciences, Harvard University, Cambridge, MA 02138, USA.
authors.forename: Ian B
authors.initials: IB
authors.lastname: Burgess
authors.forename: Yinan
authors.initials: Y
authors.lastname: Zhang
authors.forename: Murray W
authors.initials: MW
authors.lastname: McCutcheon
authors.forename: Alejandro W
authors.initials: AW
authors.lastname: Rodriguez
authors.forename: Jorge
authors.initials: J
authors.lastname: Bravo-Abad
authors.forename: Steven G
authors.initials: SG
authors.lastname: Johnson
authors.forename: Marko
authors.initials: M
authors.lastname: Loncar
mesh_terms: D017076:Computer-Aided Design; D003460:Crystallization; D004867:Equipment Design; D019544:Equipment Failure Analysis; D008029:Lighting / Q000295:instrumentation*; D017711:Nonlinear Dynamics; D055096:Optical Devices; D017785:Photons; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D055053:Terahertz Radiation