Title

Weak Coupling Interactions of Colloidal Lead Sulphide Nanocrystals with Silicon Photonic Crystal Nanocavities Near 1.55 µm At Room Temperature

Abstract

The authors observe the weak coupling of lead sulphide nanocrystals to localized defect modes of two-dimensional silicon nanocavities. Cavity resonances characterized with ensemble nanocrystals are verified with cold-cavity measurements using integrated waveguides. Polarization dependence of the cavity field modes is observed. The linewidths measured in coupling experiments are broadened in comparison to the cold-cavity characterization, partly due to large homogeneous linewidths of the nanocrystals. The calculated Purcell factor [Phys. Rev.69, 681 (1946)] for a single exciton is 100, showing promise toward applications in single photon systems. These novel light sources operate near 1.55 µm wavelengths at room temperature, permitting integration with current fiber communication networks.

Department(s)

Mechanical and Aerospace Engineering

Keywords and Phrases

Quantum Dots; Nanocrystals; Silicon; Photoluminescence; Photonic Crystals; Cavitation; II-VI Semiconductors; Polarization; Colloidal Systems; Photonic Crystal Devices

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2007 American Institute of Physics (AIP), All rights reserved.

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