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On-chip second-harmonic generation and broadband parametric down-conversion in a lithium niobate microresonator
Optics Express
|October 19, 2017
Summary
Researchers developed an ultra-broadband nonlinear optical device using lithium niobate microresonators. This breakthrough enables efficient on-chip generation of entangled photon pairs for quantum information processing.
Area of Science:
- Photonics
- Quantum Optics
- Materials Science
Background:
- Nonlinear wavelength conversion is crucial for photonic applications.
- Second-order nonlinear optical processes often have limited spectral bandwidths, hindering applications.
- Integrated photonics requires efficient and broadband nonlinear optical devices.
Purpose of the Study:
- To demonstrate efficient second-harmonic generation and spontaneous parametric down-conversion on a chip.
- To achieve ultra-broadband spontaneous parametric down-conversion using a microresonator.
- To explore the potential of integrated nonlinear optics for quantum information processing.
Main Methods:
- Utilized a high-Q X-cut lithium niobate microdisk resonator.
- Employed cyclic phase matching and rich optical mode structures.
- Measured down-converted photon spectra and biphoton temporal correlations.
Main Results:
- Achieved ultra-broadband spontaneous parametric down-conversion with a bandwidth exceeding 400 nm.
- Demonstrated efficient on-chip second-harmonic generation.
- Observed strong temporal correlations in generated biphoton pairs with a high coincidence-to-accidental ratio (43.1).
Conclusions:
- Lithium niobate microresonators are effective for ultra-broadband nonlinear wavelength conversion.
- The developed device is promising for integrated quantum photonics.
- Optical frequency can be utilized as a degree of freedom for signal processing in quantum applications.
