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Enhancement of Purcell factor in all-dielectric dimer
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Paper Abstract

We report Purcell factor enhancement in Silicon dimer in the visible region. Dimer of Silicon spheres having diameter 130 nm has the electric field enhancement at the wavelength of 620 nm. Point electric dipole has been placed between the Silicon dimer to calculate the Purcell factor. Purcell factor or spontaneous emission rate depends on quality factor Q and mode volume V by the relation Q/V. For high Purcell factor, quality factor should be high and mode volume should be small. But high quality factor has the disadvantage that light matter interaction takes place over a very narrow bandwidth. So that coupling of emitters with cavities is very weak. Another way of increasing Purcell factor is to decrease mode volume. In our design, quality factor is 50 which is not so high but mode volume is very small of the order of 10-4 μm3 , which results in very high Purcell factor of 2400. Enhancement of Purcell factor takes place due to high local density of states. In this type of dielectric nanoparticles, electric field enhancement takes place due to Mie resonance. In single dielectric nanoparticle, electric and magnetic field confine in the nanoparticle at the wavelengths of resonance. But, in the dielectric dimer, electric field confinement between the two nanoparticles results in high Purcell factor. High Purcell factor in dielectric nanoparticles leads to many applications in nanoantennas and lasers.

Paper Details

Date Published: 19 September 2018
PDF: 6 pages
Proc. SPIE 10720, Nanophotonic Materials XV, 107200W (19 September 2018); doi: 10.1117/12.2321041
Show Author Affiliations
Reena Dalal, Delhi Technological Univ. (India)
Yogita Kalra, Delhi Technological Univ. (India)
Ajeet Kumar, Delhi Technological Univ. (India)

Published in SPIE Proceedings Vol. 10720:
Nanophotonic Materials XV
Stefano Cabrini; Gilles Lérondel; Adam M. Schwartzberg; Taleb Mokari, Editor(s)

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