PbSe quantum dots grown in a high-index, low-melting-temperature glass for infrared laser applications

Abstract

PbSe quantum dots (QDs) were grown in high-refractive-index low-melting-temperature leadphosphate glass. QDs with various sizes ranging from 2 nm to 5.3 nm were grown by controlling the growth parameters, heat-treatment temperature and time. The corresponding room-temperature exciton absorption was tuned within the infrared region from 0.93 µm to 2.75 µm. Photoluminescence was measured for samples with absorption peaks above 0.95eV. Real time quantum dot growth was demonstrated by monitoring the evolution of exciton absorption with temperature and time duration. As a demonstration of the use of QDs in laser applications, the saturation fluence (F sat ) of one of the QDs was evaluated and found to be ~2.1 µJ/cm 2 at 1.2 µm.

Advances in Mid-Infrared Spectroscopy for Chemical Analysis

“…Since their discovery, quantum dots (QDs) have found application in various optical components, also leading to the development of quantum dot lasers (QDLs) operating in part at MIR frequencies (55). Due to the intrinsic variability in the composition of materials such as PbSe, PbS, PbTe, CdTe, HgSe, or InSe, their electronic and optical properties may also be tuned by size (Figure 3), thus providing tailored emissions in the MIR (56).…”