Helmut Hofer
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View article: A germanium-vacancy center in diamond as single-photon source for radiometric application
A germanium-vacancy center in diamond as single-photon source for radiometric application Open
We present the metrological characterization of a single-photon source based on a germanium-vacancy center in diamond under a solid immersion lens in a confocal microscope setup at room temperature. It was characterized in terms of the emi…
View article: Bright single-photon emission from a GeV center in diamond under a microfabricated solid immersion lens at room temperature
Bright single-photon emission from a GeV center in diamond under a microfabricated solid immersion lens at room temperature Open
We report on the metrological characterization of the emission from a germanium-vacancy center in diamond under a microfabricated solid immersion lens in a confocal laser-scanning microscope setup. Ge ions were implanted into a synthetic d…
View article: Comparison of back focal plane imaging of nitrogen vacancy centers in nanodiamond and core-shell CdSe/CdS quantum dots
Comparison of back focal plane imaging of nitrogen vacancy centers in nanodiamond and core-shell CdSe/CdS quantum dots Open
We report on the characterization of the angular-dependent emission of two different single-photon emitters based on nitrogen-vacancy centers in nanodiamond and on core-shell CdSe/CdS quantum dot nanoparticles. The emitters were characteri…
View article: Almost existence from the feral perspective and some questions
Almost existence from the feral perspective and some questions Open
We use feral pseudoholomorphic curves and adiabatic degeneration to prove an extended version of the so-called ‘almost existence result’ for regular compact Hamiltonian energy surfaces. That is, that for a variety of symplectic manifolds e…
View article: Feral Curves and Minimal Sets
Feral Curves and Minimal Sets Open
Here we prove that for each Hamiltonian function $H\in \mathcal{C}^\infty(\mathbb{R}^4, \mathbb{R})$ defined on the standard symplectic $(\mathbb{R}^4, ω_0)$, for which $M:=H^{-1}(0)$ is a non-empty compact regular energy level, the Hamilt…
View article: Exhaustive Gromov compactness for pseudoholomorphic curves
Exhaustive Gromov compactness for pseudoholomorphic curves Open
Here we extend the notion of target-local Gromov convergence of pseudoholomorphic curves to the case in which the target manifold is not compact, but rather is exhausted by compact neighborhoods. Under the assumption that the curves in que…
View article: Lectures on Polyfolds and Symplectic Field Theory
Lectures on Polyfolds and Symplectic Field Theory Open
This is a lecture note prepared for the SFT 9 workshop in Augsburg, Germany. The text describes a polyfold approach to the construction of symplectic field theory and focuses on the perturbation and transversality theory.
View article: Polyfold and SFT Notes II: Local-Local M-Polyfold Constructions
Polyfold and SFT Notes II: Local-Local M-Polyfold Constructions Open
Some early chapters of the upcoming book "Polyfold Constructions: Tools, Techniques, and Functors"
View article: Polyfold and SFT Notes I: A Primer on Polyfolds and Construction Tools
Polyfold and SFT Notes I: A Primer on Polyfolds and Construction Tools Open
Notes for the upcoming Workshop on Symplectic Field Theory IX, Polyfolds for SFT. These notes are essentially the first few chapters of a forthcoming book entitled "Polyfold Constructions: Tools, Techniques, and Functors"
View article: The absolutely characterized nitrogen vacancy center-based single-photon source – measurement uncertainty of photon flux and angular emission properties
The absolutely characterized nitrogen vacancy center-based single-photon source – measurement uncertainty of photon flux and angular emission properties Open
Recently, a single-photon source based on the nitrogen vacancy center in a nanodiamond with a traceable spectral photon flux was realized [1]. In this article, we report on the determination of the measurement uncertainty of the spectral p…
View article: Comparison at the sub-100 fW optical power level of calibrating a single-photon detector using a high-sensitive, low-noise silicon photodiode and the double attenuator technique
Comparison at the sub-100 fW optical power level of calibrating a single-photon detector using a high-sensitive, low-noise silicon photodiode and the double attenuator technique Open
A comparison down to sub-100-fW optical power level was carried out between a low-noise Silicon photodiode and a low optical flux measurement facility based on a double attenuator technique. The comparison was carried out via a silicon sin…