Multi-color laser excitation of diamond nitrogen vacancy centers embedded in nanophotonic structures

  • Negatively charged nitrogen vacancy centers (NV−) in diamond serve as highly sensitive, optically readable sensors for magnetic fields. Improved sensing approaches rely on NV− centers embedded in diamond nanopillar waveguides, which enable scanning probe imaging and use multi-color laser schemes for efficient spin readout. In this work, we investigate the free-beam coupling of the most relevant laser wavelengths to diamond nanopillars with different geometries. We focus on cylindrical pillars, conical pillars, and conical pillars with an added parabolic dome. We study the effects of the pillar geometry, NV− position, laser wavelength, position of laser focus, and excitation geometry (excitation from the top facet or from the substrate side). We find a pronounced impact of the laser wavelength that should be considered in multi-color excitation of NV−. Within the pillars, exciting laser fields can be enhanced up to a factor of 11.12 compared to bulk. When focusing the laser to the interface between the substrate and the nanopillar, even up to 29.78-fold enhancement is possible. Our results are in accordance with the experimental findings for green laser excitation of NV− in different pillar geometries

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Author:Axel HochstetterORCiD, Elke Neu-RuffingORCiD
URN (permanent link):urn:nbn:de:hbz:386-kluedo-66110
Parent Title (English):AIP Advances
Document Type:Article
Language of publication:English
Publication Date:2021/06/02
Year of Publication:2021
Publishing Institute:Technische Universität Kaiserslautern
Date of the Publication (Server):2021/10/07
Tag:FDTD; Photonic structures; diamond
Issue:11, 065006 (2021)
Number of page:7
Faculties / Organisational entities:Fachbereich Physik
DDC-Cassification:5 Naturwissenschaften und Mathematik / 530 Physik
PACS-Classification (physics):40.00.00 ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS / 42.00.00 Optics (for optical properties of gases, see 51.70.+f; for optical properties of bulk materials and thin films, see 78.20.-e; for x-ray optics, see 41.50.+h) / 42.79.-e Optical elements, devices, and systems (for integrated optics, see 42.82.-m; for fiber optics, see 42.81.-i); Optical instruments, equipment and techniques, see 07.60.-j and 07.57.-c; Optical spectrometers, see 07.57.Ty and 07.60.Rd; Photography, photogra / 42.79.Gn Optical waveguides and couplers (for fiber waveguides and waveguides in integrated optics, see 42.81.Qb and 42.82.Et, respectively)
Licence (German):Zweitveröffentlichung