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Adiabatic Nanofocusing Scattering-Type Optical Nanoscopy of Individual Gold Nanoparticles
Sadiq, Diyar,Shirdel, Javid,Lee, Jae Sung,Selishcheva, Elena,Park, Namkyoo,Lienau, Christoph American Chemical Society 2011 NANO LETTERS Vol.11 No.4
<P>We explore imaging of local electromagnetic fields in the vicinity of metallic nanoparticles using a grating-coupled scattering-type near-field scanning optical microscope. In this microscope, propagating surface plasmon polariton wavepackets are launched onto smooth gold tapers where they are adiabatically focused toward the nanometer-sized taper apex. We report two-dimensional raster-scanned optical images showing pronounced near-field contrast and demonstrating sub-30 nm resolution imaging of localized surface plasmon polariton fields of spherical and elliptical nanoparticles. By comparison to three-dimensional finite-difference time domain simulations, we conclude that virtually background-free near-field imaging is achieved. The microscope combines deep subwavelength resolution, high local field intensities and a straightforward imaging contrast, making it interesting for a variety of applications in linear and nonlinear nanospectroscopy.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/nalefd/2011/nalefd.2011.11.issue-4/nl1045457/production/images/medium/nl-2010-045457_0006.gif'></P>