Ultrasmall Mode Volumes in Plasmonic Cavities of Nanoparticle‐On‐Mirror Structures
- 12 August 2016
- Vol. 12 (37), 5190-5199
- https://doi.org/10.1002/smll.201601318
Abstract
The mode volume and Purcell factor are two important parameters to assess the performance of optical nanocavities. Achieving small mode volumes and high Purcell factors for nanocavity structures while simplifying their fabrication has been a major task to realize high-performance and large-scale photonic devices and systems. Different optical resonators based on nanoparticle-on-mirror (NPoM) structures are systematically analyzed, which are easy to fabricate and flexible to use. Direct comparison of these optical resonators is made through finite-difference time-domain (FDTD) simulations. The achievement of ultrasmall mode volumes below 10 (λ/n)3 based on the NPoM structure through FDTD simulations is demonstrated by rationally selecting the structural parameters. Such NPoM structures provide a decent Purcell factor on the order of 10 , which can effectively enhance spontaneous emission and facilitate a number of photonic applications. The simulation results are confirmed by dark field scattering and second-harmonic generation measurements. This work is scientifically important and offers practical guidelines for the design of optical resonators for state-of-the-art optical and photonic devices.Keywords
Funding Information
- U.S. Department of Energy (DE‐SC0001088, DE‐SC0001299/DE‐FG02‐09ER46577)
This publication has 80 references indexed in Scilit:
- Theory of the Spontaneous Optical Emission of Nanosize Photonic and Plasmon ResonatorsPhysical Review Letters, 2013
- Probing the Ultimate Limits of Plasmonic EnhancementScience, 2012
- Plasmonic Properties of Gold Nanoparticles Separated from a Gold Mirror by an Ultrathin OxideNano Letters, 2012
- Optical Microcavity: Sensing down to Single Molecules and AtomsSensors, 2011
- Calibration of Silver Plasmon Rulers in the 1−25 nm Separation Range: Experimental Indications of Distinct Plasmon Coupling RegimesThe Journal of Physical Chemistry C, 2010
- Distance-Dependent Plasmon Resonant Coupling between a Gold Nanoparticle and Gold FilmNano Letters, 2008
- Dark-field microscopy studies of single metal nanoparticles: understanding the factors that influence the linewidth of the localized surface plasmon resonanceJournal of Materials Chemistry, 2008
- Electrochemical synthesis of gold nanocubesMaterials Letters, 2006
- Size-Dependent Surface Plasmon Dynamics in Metal NanoparticlesPhysical Review Letters, 1998
- Use of a perfectly conducting sphere to excite the plasmon of a flat surface. 1. Calculation of the local field with applications to surface-enhanced spectroscopyThe Journal of Physical Chemistry, 1982