Single InAsP/InP quantum dots as telecommunications-band photon sources

TL;DR

This study investigates the optical properties of single InAsP/InP quantum dots, demonstrating their potential as single-photon sources in telecommunications wavelengths through spectroscopic and photon correlation measurements.

Contribution

It provides detailed spectroscopic and temporal analysis of InAsP/InP quantum dots, highlighting their discrete energy states and single-photon emission capabilities at 1.3 μm.

Findings

Discrete electron-hole states observed in spectra

Cascade emission confirms multi-exciton states

Single-photon emission demonstrated at 1.3 μm

Abstract

The optical properties of single InAsP/InP quantum dots are investigated by spectrally-resolved and time-resolved photoluminescence measurements as a function of excitation power. In the short-wavelength region (below 1.45 $\mu$m), the spectra display sharp distinct peaks resulting from the discrete electron-hole states in the dots, while in the long-wavelength range (above 1.45 $\mu$m), these sharp peaks lie on a broad spectral background. In both regions, cascade emission observed by time-resolved photoluminescence confirms that the quantum dots possess discrete exciton and multi-exciton states. Single photon emission is reported for the dots emitting at 1.3 $\mu$m through anti-bunching measurements.