Kavli Affiliate: Scott K. Cushing
| First 5 Authors: Ayantika Sengupta, Ayantika Sengupta, , ,
| Summary:
Compact, scalable, and multiplexed fluorescence lifetime sensors are of great
interest for point-of-care diagnostics. However, current solutions either lack
broad-range wavelength-tuning capabilities or involve complex optical setups
that hinder miniaturization. On-chip entangled photon sources offer a promising
alternative for time-resolved spectroscopy with their strong temporal
correlations, tunable spectral characteristics, and small footprints. Here, we
develop a temperature-tunable, visible quantum light source on thin-film
lithium niobate (TFLN) with a continuous tuning range greater than one octave,
spanning 564.5~nm to 1.494~$mu$m using only one waveguide. The tunability is
enabled by utilizing type-I phase matching. We measured an on-chip efficiency
of $(3.88pm0.20)times10^9$ pairs/s/mW, comparable to the most efficient
type-0 bulk lithium niobate sources. These results show that the TFLN platform
is ideal for on-chip integrated photonic and multiplexed lifetime imaging and
sensing.
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