Enhancement of Purcell factor in all-dielectric dimer

Reena Dalal; Yogita Kalra; Ajeet Kumar

doi:10.1117/12.2321041

19 September 2018 Enhancement of Purcell factor in all-dielectric dimer

Reena Dalal, Yogita Kalra, Ajeet Kumar

Proceedings Volume 10720, Nanophotonic Materials XV; 107200W (2018) https://doi.org/10.1117/12.2321041
Event: SPIE Nanoscience + Engineering, 2018, San Diego, California, United States

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.

Citation Download Citation

Reena Dalal, Yogita Kalra, and Ajeet Kumar "Enhancement of Purcell factor in all-dielectric dimer", Proc. SPIE 10720, Nanophotonic Materials XV, 107200W (19 September 2018); https://doi.org/10.1117/12.2321041

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available

Members: $17.00

Non-members: $21.00 ADD TO CART

PROCEEDINGS
6 PAGES

DOWNLOAD PAPER SAVE TO MY LIBRARY

GET CITATION

RIGHTS & PERMISSIONS

Get copyright permission Get copyright permission on Copyright Marketplace

KEYWORDS

Nanoparticles

Silicon

Dielectrics

Nanoantennas

Communication engineering

Fiber optic communications

Fiber optics

Show All Keywords

Keywords/Phrases

Search In:

Publication Years