Open AccessOn-chip second-harmonic generation and broadband parametric down-conversion in a lithium niobate microresonator
Author(s) -
Rui Luo,
Haowei Jiang,
Steven D. Rogers,
Hanxiao Liang,
Yang He,
Qiang Lin
Publication year - 2017
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.25.024531
Subject(s) - lithium niobate , optics , spontaneous parametric down conversion , resonator , second harmonic generation , broadband , nonlinear optics , photonics , optical parametric amplifier , optoelectronics , bandwidth (computing) , physics , quantum optics , photon , energy conversion efficiency , materials science , laser , quantum , optical amplifier , telecommunications , quantum entanglement , computer science , quantum mechanics
Nonlinear wavelength conversion is essential for many classical and quantum pho-tonic applications. The underlying second-order nonlinear optical processes, however, generally exhibit limited spectral bandwidths that impact their application potential. Here we use a high-Q X-cut lithium niobate microdisk resonator to demonstrate both second-harmonic generation and spontaneous parametric down-conversion on chip. In particular, our lithium niobate microresonator, with its wide-range cyclic phase matching and rich optical mode structures, is able to achieve ultra-broadband spontaneous parametric down-conversion, with a bandwidth over 400 nm, inferred from recorded spectra of the down-converted photons. The produced biphoton pairs exhibit strong temporal correlation, with a coincidence-to-accidental ratio measured to be 43.1. Our device is promising for integrated quantum photonics where optical frequency could be used as a degree of freedom for signal processing.