Experimental Comparison of Filter Integration Strategies for Nitrogen Vacancy Center Photoluminescence Detection in Optically Detected Magnetic Resonance Measurements
Year: 2026
Type: article
Abstract: Optically detected magnetic resonance (ODMR) based on nitrogen‐vacancy (NV) centers in diamond is a powerful technique for sensing applications where the efficient detection of NV photoluminescence is a critical performance factor. Although optical filters are routinely employed to suppress the green excitation light, their integration at the detector level is often treated as a secondary design aspect. In this work, we present a systematic experimental comparison of different filter integration strategies applied directly to otherwise identical photodiodes and evaluate their impact on ODMR performance. The study was conducted using a breadboard ODMR setup comprising a green laser excitation source, a high‐pressure high‐temperature (HPHT) diamond containing NV centers with a concentration in the ppm range, microwave excitation, and lock‐in‐based signal detection. The filter variants were characterized using both ODMR contrast measurements at the NV − zero‐phonon line and optical density (OD) values extracted from laser power versus photocurrent measurements. Particular emphasis is placed on, showing that a higher OD does not always correlate with a higher ODMR contrast. We suggest that thin‐film filter approaches offer a favorable compromise between excitation suppression and ODMR signal quality, providing useful design guidance for NV‐center‐based sensing applications.
Source: physica status solidi (a)
DOI: 10.1002/pssa.70583
Institution: CiS Forschungsinstitut für Mikrosensorik GmbH
Language: English
Subfield: Materials Chemistry
Field: Materials Science
Domain: Physical Sciences
Open Access status: bronze
OpenAlex ID: W7225166008