Phys.org April 2, 2024 Researchers in China presented a single photon emitter that utilizes a single semiconductor quantum dot, deterministically coupled to a second-order topological corner state in a photonic crystal cavity. By investigating the Purcell enhancement of both single photon count and emission rate within this topological cavity, they got an experimental Purcell factor of Fp = 3.7. They demonstrated the on-demand emission of polarized single photons, with a second-order autocorrelation function g(2)(0) as low as 0.024 ± 0.103. According to the researchers their work may be used for customizing light-matter interactions in topologically nontrivial environments… read more. Open Access TECHNICAL ARTICLE
Category Archives: Photon emitters
Quantum emitters: Beyond crystal clear to single-photon pure
Phys.org September 2, 2021 Quantum dots often suffer from adjacent unwanted emitters, which contribute to the background noise of the QD emission and fundamentally limit the single-photon purity. Researchers in South Korea developed a technique that can isolate the desired quality emitter by reducing the noise surrounding the target with what they have dubbed a ‘nanoscale focus pinspot. The technique is a structurally nondestructive technique under an extremely low dose ion beam and is generally applicable for various platforms to improve their single-photon purity while retaining the integrated photonic structures. Using this technique they focused the ion beam on a […]
An electrical trigger fires single, identical photons
Phys.org October 8, 2020 An international team of researchers (USA – Lawrence Berkeley National Laboratory, Montana State University, Spain) has demonstrated electrically stimulated photon emission from individual atomic defects in monolayer WS2 and directly correlated the emission with the local atomic and electronic structure. Radiative transitions are locally excited by sequential inelastic electron tunneling from a metallic tip into selected discrete defect states in the WS2 bandgap. Coupling to the optical far field is mediated by tip plasmons, which transduce the excess energy into a single photon. The applied tip-sample voltage determines the transition energy. Inelastic charge carrier injection into […]
Tiny bubbles make a quantum leap
EurekAlert July 13, 2020 An international team of researchers (USA – UC Berkeley, Columbia University, industry, Montana State University, Germany, Japan) found that placing sufficient strain in a 2D material–tungsten diselenide creates localized states that can yield single-photon emitters. The team was able to directly image these states for the first time, revealing that even at room temperature they are highly tunable and act as quantum dots, tightly confined pieces of semiconductors that emit light. Fully tunable, room-temperature single-photon emitters are now within our grasp, paving the way for controllable–and practical quantum photonic devices. These devices can be the foundation […]