Ultrasmall subwavelength nanorod plasmonic cavity.

We propose an ultrasmall plasmonic cavity consisting of a high-index/low-index dielectric nanorod covered with silver. Full three-dimensional subwavelength confinement of the surface-plasmon polaritons was achieved at the high-index dielectric-silver interface without propagating to the low-index dielectric-silver interface. The numerical simulations showed that the plasmonic mode excited in this cavity has a deep subwavelength mode volume of 0.0038(λ/2n)(3) and a quality factor of 1500 at 40 K, and consequently a large Purcell factor of ∼2×10(5). Therefore, this plasmonic cavity is expected to be useful for the demonstration of high-efficiency single photon sources or low-threshold lasers in an ultracompact nanophotonic circuit.

[1]  Metal-coated nanocylinder cavity for broadband nonclassical light emission. , 2010, Physical review letters.

[2]  D. Englund,et al.  Controlling the spontaneous emission rate of single quantum dots in a two-dimensional photonic crystal. , 2005, Physical review letters.

[3]  Soon-Hong Kwon,et al.  Electrically Driven Single-Cell Photonic Crystal Laser , 2004, Science.

[4]  Soon-Hong Kwon,et al.  Full three-dimensional subwavelength high-Q surface-plasmon-polariton cavity. , 2009, Nano letters.

[5]  Oskar Painter,et al.  Momentum space design of high-Q photonic crystal optical cavities. , 2002, Optics express.

[6]  Jelena Vuckovic,et al.  Enhanced light emission in photonic crystal nanocavities with Erbium-doped silicon nanocrystals , 2008 .

[7]  K. Vahala,et al.  High-Q surface-plasmon-polariton whispering-gallery microcavity , 2009, Nature.

[8]  Fouad Karouta,et al.  Lasing in metal-insulator-metal sub-wavelength plasmonic waveguides. , 2009, Optics express.

[9]  V. Kulakovskii,et al.  Strong coupling in a single quantum dot–semiconductor microcavity system , 2004, Nature.

[10]  M. Smit,et al.  Lasing in metallic-coated nanocavities , 2007 .

[11]  Kengo Nozaki,et al.  Laser characteristics with ultimate-small modal volume in photonic crystal slab point-shift nanolasers , 2006 .

[12]  Shota Kita,et al.  Room temperature continuous wave operation and controlled spontaneous emission in ultrasmall photonic crystal nanolaser. , 2007, Optics express.

[13]  R. W. Christy,et al.  Optical Constants of the Noble Metals , 1972 .

[14]  Dirk Englund,et al.  Ultrafast photonic crystal lasers , 2008 .

[15]  Jelena Vučković,et al.  Design of plasmon cavities for solid-state cavity quantum electrodynamics applications , 2007 .

[16]  H. Lezec,et al.  Highly confined photon transport in subwavelength metallic slot waveguides. , 2006, Nano letters.

[17]  Philippe Regreny,et al.  Subwavelength plasmonic lasing from a semiconductor nanodisk with silver nanopan cavity. , 2010, Nano letters.

[18]  Yeshaiahu Fainman,et al.  Room-temperature subwavelength metallo-dielectric lasers , 2010 .

[19]  A. Polman,et al.  Ultrasmall mode volume plasmonic nanodisk resonators. , 2010, Nano letters (Print).