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Physics Letters A

Transmission-dispersion characteristics of waveguide-coupled photonic crystal two-mode nanocavity embedding three tunnel-coupled quantum dots

Rong Yu, Jiahua Li, Chunling Ding, Xiaoxue Yang

Published Jun 5, 2011• 10 citations
Publisher
DOI
10.1016/j.physleta.2011.05.069

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We theoretically investigate controlled tunable all-optical filtering and buffering of optical pulses in a hybrid nano-photonic structure, where a single quantum dot (QD) embedded in a photonic crystal nanocavity is side-coupled between a bare nanocavity and a photonic crystal waveguide. We demonstrate that there is a sharp low-loss transmission peak in the transmission spectrum under even low QD-nanocavity coupling strength and the input optical pulses can be delayed up to several hundred picoseconds within the dephasing time of the QD. The filtering regime can be shifted readily by manipulating the detuning between the QD excitonic transition frequency and resonant frequency of the nanocavity mode, which can be explored in future for on-chip all-optical logic and signal processing.