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Ultrasmall Mode Volumes in Plasmonic Cavities of Nanoparticle‐On‐Mirror Structures
Author(s) -
Huang Shengxi,
Ming Tian,
Lin Yuxuan,
Ling Xi,
Ruan Qifeng,
Palacios Tomás,
Wang Jianfang,
Dresselhaus Mildred,
Kong Jing
Publication year - 2016
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.201601318
Subject(s) - finite difference time domain method , resonator , plasmon , photonics , mode volume , materials science , optoelectronics , whispering gallery wave , fabrication , optics , nanotechnology , physics , optical fiber , fiber optic sensor , graded index fiber , medicine , alternative medicine , pathology
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 −7( λ / n ) 3based 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 7 , 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.