Infra-Plas: Colloidal Quantum Dots for Short-Wave Infrared Plasmonic Lasers

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Lasers and optical amplifiers in the near- and short-wave infrared regions (700 nm to 3000 nm) are are a key enabling photonictechnology in modern technologies. They span many relevant technological windows such as telecommunications bands (1250 nmto 1625 nm), LIDAR wavelengths (905 nm & 1550 nm), eye-safe wavelengths (>1400 nm), and the NIR-IIc (1700 nm to 1880 nm), NIR-III(2080 nm to 2340 nm) biological windows and atmospheric gas sensing spectroscopy (~2000 nm). However, the integration oftraditional vacuum deposited semiconductor laser diodes and silicon microelectronics/photonics is notoriously difficult due tomaterial incompatibilities, preventing the very-large scale integration of these technologies and the development of on-chipquantum communication/information devices. Solution processed PbS colloidal quantum dots (CQDs) could better serve theseapplications in the infrared as they can be readily integrated into silicon technologies, lend themselves to cost-effective large scaleproduction of photonic devices and have tunable optoelectronic properties. However, the first generation of PbS lasers suffer fromlarge FWHM (~ 4 nm) and low q-factors, limiting their application. High q-factor cavities, such as those generated from plasmonicstrucures. are therefore also required to maximize the potential of PbS CQD lasers. The aim of this project will be to make a crucialstep in advancing PbS CQD laser technology for integrated photonics and explore their viability as future photonic devices, throughthe development of plasmonic caivites.