ArticleIEEE microwave and wireless technology letters2025
Combined Super-Resolution Fluorescence and Coaxial 3D Scanning Microwave Microscopy: Proof-Of-Concept In-Liquid Live-Cell Imaging: Towards a Biological Nano-Radar.
Article in IEEE microwave and wireless technology letters, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
We present a proof-of-concept three dimensional scanning microwave microscope based on miniaturized coaxial probe combined with high-resolution fluorescence microscopy for in-liquid operation and live-cell imaging. The system simultaneously provides electric (GHz) and optical (super-resolution) imaging of live cells for broad applications in life sciences. It combines advantages offered by both open-ended coaxial probing and near-field scanning microwave microscopy (SMM) for accurate and quantitative local microwave measurements. The shielded tip minimizes unwanted absorption of microwaves by the biological media as compared to fringe fields of an unshielded tips which we previously showed absorb over 90% of the signal and mask the true imaging signal. A proof-of-concept system built up with commercial off the shelf (COTS) components is demonstrated in the frequency range 0.01 ‒ 6 GHz with micrometric spatial resolution, only limited by the coaxial probe geometry. Our work at the microscale lays the technological foundation for a true nano-radar in liquid cell imaging system that will come with further advances in nanofabrication technologies applied to coaxial probes, and can be integrated with super-resolution optical microscopy, for an integrated full electromagnetic spectrum to probe biology at the nanoscale, from dc to lightwave.
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