Spectroscopy of 1.55 $\mu$m PbS Quantum Dots on Si Photonic Crystal Cavities with a Fiber Taper Waveguide

Abstract

We use an optical fiber taper waveguide to probe PbS quantum dots (QDs) dried on Si photonic crystal cavities near 1.55 $\mu$m. We demonstrate that a low density ($\lesssim 100\mu$m${}^{-2}$) of QDs does not significantly degrade cavity quality factors as high as $\approx 3\times 10^4$. We also show that the tapered fiber can be used to excite the QDs and collect the subsequent cavity-filtered photoluminescence, and present measurements of reversible photodarkening and QD saturation. This method represents an important step towards spectroscopy of single colloidal QDs in the telecommunications band.

References in corpus (3)

• Linear and nonlinear optical spectroscopy of a strongly-coupled microdisk-quantum dot system
• Optical-fiber based measurement of an ultra-small volume high-Q photonic crystal microcavity
• Weak coupling interactions of colloidal lead sulphide nanocrystals with silicon photonic crystal nanocavities near 1.55 microns at room temperature

Cited by in corpus (4)

• Hybrid integration of solid-state quantum emitters on a silicon photonic chip
• Fiber-based cryogenic and time-resolved spectroscopy of PbS quantum dots
• Polarons Explain Luminescence Behavior of Colloidal Quantum Dots at Low Temperature
• Overcoming Auger recombination in nanocrystal quantum dot laser using spontaneous emission enhancement