Researchers have created chip-based photonic resonators that operate in the ultraviolet (UV) and visible regions of the spectrum and exhibit a record low UV light loss. The new resonators lay the groundwork for increasing the size, complexity and fidelity of UV photonic integrated circuit (PIC) design, which could enable new miniature chip-based devices for applications such as spectroscopic sensing, underwater communication and quantum information processing.
"Compared to the better-established fields like telecom photonics and visible photonics, UV photonics is less explored even though UV wavelengths are needed to access certain atomic transitions in atom/ion-based quantum computing and to excite certain fluorescent molecules for biochemical sensing," said research team member Chengxing He from Yale University."Our work sets a good basis toward building photonic circuits that operate at UV wavelengths.
"The previous record was accomplished with aluminum nitride, which has a bandgap of ~6eV," He said."Compared to single crystal aluminum nitride, amorphous ALD alumina has fewer defects and is less challenging to fabricate, which helped us to achieve lower loss." After fabricating ring resonators based on these calculations, the researchers determined their Q factors by measuring the width of resonance peaks while scanning the light frequency injected into the resonator. They found a record-high quality factor of 1.5 × 10at 488.5 nm . Higher Q-factors indicate less light loss.
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