Abstract
We review the characteristics and applications of photonic crystal ring resonators (PCRRs), which can potentially provide a good alternative to the traditional micro ring resonators, as one of the key contributors to the emerging low-power nanophotonic technology. Applying numerical analysis together with the theory of mode superposition, the properties of PCRRs have been comprehensively investigated. We will report PCRR key characteristics, including diameter (D)-dependent loss, quality factor (Q), and free spectral range (FSR). No size-dependent loss was found in PCRRs, unlike the approximately 1/D dependent loss in micro-strip resonators, making PCRRs a promising candidate for ultra-compact ring resonators.
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