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arXiv · 1502.02736

A Sub-$\rm λ^{3}$-Volume Cantilever-based Fabry-Pérot Cavity

Hrishikesh Kelkar·Daqing Wang·Diego Martín-Cano·Björn Hoffmann·Silke Christiansen·Stephan Götzinger·Vahid Sandoghdar
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Abstract

We report on the realization of an open plane-concave Fabry-Pérot resonator with a mode volume below $λ^3$ at optical frequencies. We discuss some of the less common features of this new microcavity regime and show that the ultrasmall mode volume allows us to detect cavity resonance shifts induced by single nanoparticles even at quality factors as low as $100$. Being based on low-reflectivity micromirrors fabricated on a silicon cantilever, our experimental arrangement provides broadband operation, tunability of the cavity resonance, lateral scanning and promise for optomechanical studies.

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Hrishikesh Kelkar, Daqing Wang, Diego Martín-Cano, Björn Hoffmann, Silke Christiansen, Stephan Götzinger, Vahid Sandoghdar. 2015-07-01. A Sub-$\rm λ^{3}$-Volume Cantilever-based Fabry-Pérot Cavity. https://doi.org/10.1103/physrevapplied.4.054010

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