Point defects in crystals provide important building blocks for quantum applications. Since we optically address these defect qubits, having an efficient optical interface is a highly important aspect. However, conventional confocal fluorescence microscopy of high-refractive-index crystals suffers from limited photon collection efficiency and spatial resolution. Here, we demonstrate high-resolution, high-contrast imaging of defects in diamonds using microsphere-assisted confocal microscopy. A microsphere provides an excellent optical interface for point defects with a magnified virtual image that increases the spatial resolution up to λ/5, as well as the optical signal-to-noise ratio by four times. These features enable individual optical addressing of single photons and single spins of multiple defects that are spatially unresolved in conventional confocal microscopy, with improved signal contrast. Combined with optical tweezers, this system also demonstrates the possibility of positioning or scanning the microspheres. The approach does not require any complicated fabrication or additional optical systems, but uses simple, off-the-shelf micro-optics. From these distinctive advantages of microspheres, our approach provides an efficient way to image and address closely spaced defects with much better resolution and sensitivity.
%0 Journal Article
%1 doi:10.1021/acsphotonics.1c00576
%A Moon, Jong Sung
%A Lee, Haneul
%A Lee, Jin Hee
%A Jeon, Woong Bae
%A Lee, Dowon
%A Lee, Junghyun
%A Paik, Seoyoung
%A Han, Sang-Wook
%A Reuter, Rolf
%A Denisenko, Andrej
%A Wrachtrup, Jörg
%A Lee, Sang-Yun
%A Kim, Je-Hyung
%D 2021
%J ACS Photonics
%K pi3 wrachtrup
%N 9
%P 2642-2649
%R 10.1021/acsphotonics.1c00576
%T High-Resolution, High-Contrast Optical Interface for Defect Qubits
%U https://doi.org/10.1021/acsphotonics.1c00576
%V 8
%X Point defects in crystals provide important building blocks for quantum applications. Since we optically address these defect qubits, having an efficient optical interface is a highly important aspect. However, conventional confocal fluorescence microscopy of high-refractive-index crystals suffers from limited photon collection efficiency and spatial resolution. Here, we demonstrate high-resolution, high-contrast imaging of defects in diamonds using microsphere-assisted confocal microscopy. A microsphere provides an excellent optical interface for point defects with a magnified virtual image that increases the spatial resolution up to λ/5, as well as the optical signal-to-noise ratio by four times. These features enable individual optical addressing of single photons and single spins of multiple defects that are spatially unresolved in conventional confocal microscopy, with improved signal contrast. Combined with optical tweezers, this system also demonstrates the possibility of positioning or scanning the microspheres. The approach does not require any complicated fabrication or additional optical systems, but uses simple, off-the-shelf micro-optics. From these distinctive advantages of microspheres, our approach provides an efficient way to image and address closely spaced defects with much better resolution and sensitivity.
@article{doi:10.1021/acsphotonics.1c00576,
abstract = { Point defects in crystals provide important building blocks for quantum applications. Since we optically address these defect qubits, having an efficient optical interface is a highly important aspect. However, conventional confocal fluorescence microscopy of high-refractive-index crystals suffers from limited photon collection efficiency and spatial resolution. Here, we demonstrate high-resolution, high-contrast imaging of defects in diamonds using microsphere-assisted confocal microscopy. A microsphere provides an excellent optical interface for point defects with a magnified virtual image that increases the spatial resolution up to λ/5, as well as the optical signal-to-noise ratio by four times. These features enable individual optical addressing of single photons and single spins of multiple defects that are spatially unresolved in conventional confocal microscopy, with improved signal contrast. Combined with optical tweezers, this system also demonstrates the possibility of positioning or scanning the microspheres. The approach does not require any complicated fabrication or additional optical systems, but uses simple, off-the-shelf micro-optics. From these distinctive advantages of microspheres, our approach provides an efficient way to image and address closely spaced defects with much better resolution and sensitivity. },
added-at = {2022-02-23T12:39:43.000+0100},
author = {Moon, Jong Sung and Lee, Haneul and Lee, Jin Hee and Jeon, Woong Bae and Lee, Dowon and Lee, Junghyun and Paik, Seoyoung and Han, Sang-Wook and Reuter, Rolf and Denisenko, Andrej and Wrachtrup, Jörg and Lee, Sang-Yun and Kim, Je-Hyung},
biburl = {https://puma.ub.uni-stuttgart.de/bibtex/2ee675f1f46d0d355ea637901ce2b663d/shirschmann},
doi = {10.1021/acsphotonics.1c00576},
eprint = {https://doi.org/10.1021/acsphotonics.1c00576},
interhash = {1d9fbad45cfd64dd690a8fc16f8585e2},
intrahash = {ee675f1f46d0d355ea637901ce2b663d},
journal = {ACS Photonics},
keywords = {pi3 wrachtrup},
number = 9,
pages = {2642-2649},
timestamp = {2022-02-23T11:39:43.000+0100},
title = {High-Resolution, High-Contrast Optical Interface for Defect Qubits},
url = {https://doi.org/10.1021/acsphotonics.1c00576 },
volume = 8,
year = 2021
}
