Selective switching of individual multipole resonances in single dielectric nanoparticles. Issue 2 (10th March 2015)

• Record Type: Journal Article
• Authors: Woźniak, Paweł; Banzer, Peter; Leuchs, Gerd
• Is Part Of: Laser & photonics reviews. Volume 9:Issue 2(2015:Mar.)
• Page Start: 231
• Page End: 240
• Publication Date: 2015-03-10
• Subjects: Mie scattering -- dielectric nanoparticles -- magnetic resonance -- cylindrical vector‐beams -- polarization tailoring; Lasers -- Periodicals; Photonics -- Periodicals; Lasers -- Périodiques; Photonique -- Périodiques; 621.36
• DOI: 10.1002/lpor.201400188
• Languages: English
• ISSNs: 1863-8880

Abstract

Abstract : High refractive‐index dielectric nanoparticles support not only electric but also strong magnetic resonances, which are accessible under plane‐wave illumination. Here, it is shown that by tailoring the excitation field, individual multipole resonances can be selectively addressed and studied while not permitting excitation of other particle modes. Abstract: Following Mie theory, nanoparticles made of a high‐refractive‐index dielectric, such as silicon, exhibit a resonator‐like behavior and very rich resonance spectra. Which electric or magnetic particle mode is excited depends on the wavelength, the refractive‐index contrast relative to the environment, and the geometry of the nanoparticle itself. In addition, the spatial structure of the impinging light field plays a major role in the excitation of the nanoparticle resonances. Here, it is shown that, by tailoring the excitation field, individual multipole resonances can be selectively addressed while suppressing the excitation of other particle modes. This enables a detailed study of selected individual resonances without interference by the other modes.