Quantum defects in diamonds have been studied as a promising resource for quantum science. The subtractive fabrication process for improving photon collection efficiency often require excessive milling time that can adversely affect the fabrication accuracy. We designed and fabricated a Fresnel-type solid immersion lens using the focused ion beam. For a 5.8 um-deep Nitrogen-vacancy (NV-) center, the milling time was highly reduced (1/3 compared to a hemispherical structure), while retaining high photon collection efficiency (> 2.24 compared to a flat surface). In numerical simulation, this benefit of the proposed structure is expected for a wide range of milling depths.
@article{arxiv.2303.10524,
title = {Fresnel-type Solid Immersion Lens for efficient light collection from quantum defects in diamond},
author = {SungJoon Park and Gyeonghun Kim and Kiho Kim and Dohun Kim},
journal= {arXiv preprint arXiv:2303.10524},
year = {2023}
}