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The traditional method of joint calibration of fixed baseline interferometer with multiple errors requires more than three calibration emitters to achieve real-time calibration of the interferometer in orbit, but the performance of the traditional method will be reduced or even failed when the number of calibration emitters is insufficient. For the situation that the number of calibration emitters is insufficient, a single or double emitters calibration method for fixed baseline interferometer is proposed. Under the condition of relative motion between the interferometer and the calibration emitters, a set of phase differences of calibration signals is obtained firstly by multiple measurements, and a set of equations about the systematic errors of the interferometer is listed by using the obtained phase differences, finally the systematic errors are solved by the Penrose inverse matrix assisted iterative least squares method. The simulation results verify the feasibility of the proposed method. On this basis, the influence of the emitter selection on the positioning performance of the interferometer after calibration is analyzed qualitatively by means of numerical simulation, decomposing the parameters of the emitter selection. The analysis results show that the calibration emitter located near the sub-star in the single emitter case or two calibration emitters located far apart both can make the interferometer obtain better positioning performance after calibration.

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Manipulating single emitter radiation is essential for quantum information science. Significant progress has been made in enhancing the radiation efficiency and directivity by coupling quantum emitters with microcavities and plasmonic antennas. However, there has been a great challenge to generate complex radiation patterns such as vortex beam from a single emitter. Here, we report a chiral plasmonic nanocavity, which provides a strong local chiral vacuum field at an exceptional point. We show that a single linear dipole emitter embedded in the nanocavity will radiate to vortex beam via anomalous spontaneous emission with a Purcell enhancement factor up to ∼1000. Our scheme provides a new field manipulation method for chiral quantum optics and vortex lasers at the nanoscale.

Abstract The development of white organic light-emitting diodes (WOLEDs) holds great promise for the production of high-color-quality lighting sources. High quantum efficiencies for the conversion of electrical energy to light have been realized. The color stability and color-rendering index (CRI) become bottleneck for the commercial application of WOLEDs. Here, we employed a metal-free dimerization of 1‑phenyl‑3,5‑diamine‑triazine (DPDT) as a single non-doped emitter in WOLEDs, that exhibits mild efficiency roll-off while maintaining CRI of 92. This high CRI is attributable to the DPDT with efficient monomer and excimer emission, which together emit a relatively wide spectrum that nearly covers the entire range of visible light. The formation of the excimer can make the emission color of single-emitter based WOLEDs tunable with the applied bias over a wide range from blue to pure white. Highlights • The metal-free dimerization of 1-phenyl-3,5-diamine-triazine (DPDT) materials were synthesized. • The emission color can be tuned over a wide range from blue to pure white. • The resulting color tunable WOLEDs achieves mild efficiency roll-off while maintaining CRI of 92. [ABSTRACT FROM AUTHOR]

Highlights • A 36-W green laser diode laser with fiber-coupled output based on TO-Can packaged emitters is designed. • The green diode laser is realized by using the technologies of beam collimation, spatial beam combining, polarized beam combining, and fiber coupling. • The combined beam can be coupled into a fiber with a core diameter of 200 μm and a numerical aperture (NA) of 0.22, and a coupling efficiency of 92%. Abstract We propose a design of a 36 W fiber-coupled green diode laser based on TO-Can packaged emitters using Zemax. This is achieved by beam collimation, spatial beam combining, polarized beam combining and fiber coupling. The simulation results show that the combined beam can be coupled into a fiber with a core diameter of 200 μm and a numerical aperture (NA) of 0.22 by using 40 of 1-W TO-Can emitters at 516 nm, and a fiber combining efficiency of 92% can be achieved. [ABSTRACT FROM AUTHOR]

In recent years, the controlled coupling of single-photon emitters to propagating surface plasmons has been intensely studied, which is fueled by the prospect of a giant photonic nonlinearity on a nanoscaled platform. In this article, we will review the recent progress on coupling single emitters to nanowires towards the construction of a new platform for strong light-matter interaction. The control over such a platform might open new doors for quantum information processing and quantum sensing at the nanoscale and for the study of fundamental physics in the ultrastrong coupling regime.

We have developed a high color rendering index (CRI) top-emitting white organic light-emitting diode (TWOLEDs) using single emitter by enhancing the yellow-green part between the monomer and excimer emission of platinum [1,3-difluoro-4,6-di(2-pyridyl)benzene] chloride via microcavity effect. Resonant wavelengths can well-tuned by adjusting the thickness of the hole transport layer to modify the optical cavity length. The TWOLEDs exhibits four-peak spectra at 480, 512, 556, and 600 nm with maximum color rendering index of 83 and full half-maximum width of 200 nm. Meanwhile, the chromaticity of TWOLEDs is quite stable, showing slight Commission Internationale deL'Eclairage coordinate shifts of (±0.005, ±0.004) over the driving voltage range of 4–10 V. [Display omitted] • High color rendering index and chromaticity stable top-emitting white OLEDs with single emitter. • Four peak emission are achieved by combining monomer, excimer emission and resonant cavity. • Weak microcavity white OLEDs were investigated and modelled. • The device emission shows a Lambertian-like characteristic. [ABSTRACT FROM AUTHOR]

Abstract: In this paper, we introduce a modified inverted microscope system in which an objective with high NA (0.95) is located under high-vacuum conditions, and a time-correlated single photon counting system is used along with a modified photomultiplier tube for the characterization of single emitters under high-vacuum conditions. The modified inverted microscope system is designed to be simple, compact, and easy to handle. As an example, the optical properties of individual colloidal semiconductor nanocrystals (CdSe/ZnS) were studied by using these systems. [Copyright &y& Elsevier]

A thermally activated delayed fluorescence (TADF) emitter, named 4CzDBN , was developed with benzonitrile and carbazole groups. It's highly symmetrical and elongated framework was intentionally devised to form strong intermolecular π-π interactions in the condensed state. Through a series of detailed studies on the photophysical properties, single crystal structures and theoretical calculations of 4CzDBN , the impact of molecular structure regulation on excited state properties were investigated thoroughly. Finally, organic light-emitting diodes (OLEDs) utilizing 4CzDBN as the single emitter realized full-color emission from sky blue (480 nm) to orange red (580 nm) at different doping concentrations, as the first single-emitter full-color OLED. Image 1 • A novel molecular design strategy was proposed, 4CzDBN structure with highly symmetrical and elongated skeleton was deliberately devised to form strong intermolecular π-π interactions. • Through simply adjusting the doping concentrations of 4CzDBN in thin films, the maximum emission can be tuned from 494 to 554 nm. • The investigation on the single crystal structures and theoretical calculations confirm the underlying mechanism that luminescent regulation can be achieved by intermolecular π-π interactions. • 4CzDBN based single-emitter OLEDs realized full-color emission (from 480 nm to 580 nm) via tuning the doping concentrations for the first time ever. [ABSTRACT FROM AUTHOR]