Glass-patternable notch-shaped microwave architecture for on-chip spin detection in biological samples

TL;DR

This paper introduces a glass-patterned notch-shaped microwave antenna for on-chip detection of optically detected magnetic resonance in biological samples, enabling scalable quantum sensing integration.

Contribution

A novel glass-patterned notch-shaped microwave architecture for uniform ODMR detection in biological samples is demonstrated.

Findings

Achieved a millimeter-scale ODMR detection area with broadband characteristics.

Demonstrated uniform ODMR signals across cells, tissue, and worms.

Low reflection (~8%) indicates efficient microwave transmission.

Abstract

We report a notch-shaped coplanar microwave waveguide antenna on a glass plate designed for on-chip detection of optically detected magnetic resonance (ODMR) of fluorescent nanodiamonds (NDs). A lithographically patterned thin wire at the center of the notch area in the coplanar waveguide realizes a millimeter-scale ODMR detection area (1.5 x 2.0 mm^2) and gigahertz-broadband characteristics with low reflection (about 8%). The ODMR signal intensity in the detection area is quantitatively predictable by numerical simulation. Using this chip device, we demonstrate a uniform ODMR signal intensity over the detection area for cells, tissue, and worms. The present demonstration of a chip-based microwave architecture will enable scalable chip integration of ODMR-based quantum sensing technology into various bioassay platforms.