Giant electric and magnetic Purcell factor in dielectric oligomers
Davide Rocco, Aristeidis Lamprianidis, Andrey E. Miroshnichenko, Costantino De Angelis
Abstract
We study the near-field enhancement of oligomers composed of high-refractive-index spherical particles. The huge enhancement of the electromagnetic field in the gap between the particles is observed. We reveal that this phenomenon is associated with the Fano-like resonances of both electric and magnetic multipole contributions inside each particle. We also predict that electric and magnetic Purcell factors can be strongly enhanced, being larger than <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"> <mml:mrow class="MJX-TeXAtom-ORD"> <mml:msup> <mml:mn>10</mml:mn> <mml:mn>3</mml:mn> </mml:msup> </mml:mrow> </mml:math> . The obtained results represent an important guideline for the realization of dielectric structures to enhance the spontaneous emission rate of quantum sources and various two-level systems.