We study the interaction between a planar Fabry–Perot microcavity and a single embedded gold nanoparticle. We record spatially resolved white-light transmission spectra and show that the interaction between microcavity and nanoparticle gives rise to a redshift of the cavity modes, in accordance with the Bethe–Schwinger cavity perturbation formula. The spectral tuning of cavity modes by discrete nanoparticles can be exploited for applications such as optical and micromechanical sensing.
© 2010 Optical Society of America
Original Manuscript: January 6, 2010
Revised Manuscript: February 19, 2010
Manuscript Accepted: February 20, 2010
Published: March 19, 2010
Anirban Mitra, Hayk Harutyunyan, Stefano Palomba, and Lukas Novotny, "Tuning the cavity modes of a Fabry–Perot resonator using gold nanoparticles," Opt. Lett. 35, 953-955 (2010)