We demonstrate integrated lithium niobate (LN) microring resonators with Q factors close to the intrinsic material absorption limit of LN. The microrings are fabricated on pristine LN thin-film wafers thinned from bulk via chemo-mechanical etching without ion slicing and etching. A record-high factor up 108 at wavelength 1550 nm is achieved because ultra-smooth interface absence ion-induced lat...

We introduce a method for designing an H1 photonic crystal cavity to enhance its quality factor (Q factor). The highest theoretical Q factor of 120,000 is obtained. The Fourier transformation of field distribution shows that the enhancement arises from the component reduction of a leaky mode. The Q-factor improvement has also been demonstrated experimentally with the highest value of 11,700. Ou...

Most Surface-enhanced Raman scattering (SERS) substrates enhance all the signals in a relative broad spectral range. The both interested and background together. To improve identification of target molecules from numerous ones, with multi high-quality (Q) factor resonance wavelengths can be designed to achieve selective enhancement specific transitions. When frequencies are modulated match exci...