Silicon Photonic Crystal Ring Resonator With High-Quality-Factor

We propose and experimentally demonstrate a silicon PCRR with a high
${Q}$
factor. By manipulating the radii and locations of the key holes, the tangential k-vector component inside the leaky region could be effectively reduced. Consequently, the theoretical and experimental
${Q}$
factors are significantly improved to
$7.28\times 10^{5}$
and
$2.44\times 10^{5}$
, respectively. To the best of our knowledge, it is the highest
${Q}$
factor of the silicon PCRRs with such a compact size. Owing to the dominant advantages of high-
${Q}$
factors, compact size (
$81~\mu ~\text{m}^{2}$
) and complementary metal-oxide semiconductor (CMOS)-compatibility, the proposed silicon PCRRs are favorable for on-chip low-threshold lasers and channel drop filters.