Local electric field enhancement during nanofocusing of plasmons by a tapered gap
نویسندگان
چکیده
Dmitri K. Gramotnev,1 David F. P. Pile,2 Michael W. Vogel,1 and Xiang Zhang2 1Applied Optics Program, School of Physical and Chemical Sciences, Queensland University of Technology, GPO Box 2434, Brisbane, QLD 4001, Australia 2NSF Nano-scale Science and Engineering Center (NSEC), 5130 Etcheverry Hall, University of California, Berkeley, Berkeley, California 94720-1740, USA Received 12 November 2006; published 31 January 2007
منابع مشابه
Optimized nonadiabatic nanofocusing of plasmons by tapered metal rods
Using rigorous numerical methods of analysis, this paper investigates nonadiabatic nanofocusing in tapered nanorods with the major emphasis on structural optimization for achieving maximal possible local field enhancement. Simple analytical equations for the determination of the optimal length of the tapered rod are presented and discussed. It is also shown that for the considered structures, o...
متن کاملSplit-Wedge Antennas with Sub-5 nm Gaps for Plasmonic Nanofocusing
We present a novel plasmonic antenna structure, a split-wedge antenna, created by splitting an ultrasharp metallic wedge with a nanogap perpendicular to its apex. The nanogap can tightly confine gap plasmons and boost the local optical field intensity in and around these opposing metallic wedge tips. This three-dimensional split-wedge antenna integrates the key features of nanogaps and sharp ti...
متن کاملOptimal tapers for compensating losses in plasmonic waveguides
1 Introduction The study of the field enhancement and subwavelength focusing of light in optical waveguides is of great interest for many applications including sensing, lasing, and imaging. The light confinement in conventional optical waveguides is limited by diffraction and by that dielectric waveguides do not allow the effective field fo-cusing to dimensions less than a micron. In contrast,...
متن کاملAdiabatic Nanofocusing in Hybrid Gap Plasmon Waveguides on the Silicon-on-Insulator Platform.
We present an experimental demonstration of a new class of hybrid gap plasmon waveguides on the silicon-on-insulator (SOI) platform. Created by the hybridization of the plasmonic mode of a gap in a thin metal sheet and the transverse-electric (TE) photonic mode of an SOI slab, this waveguide is designed for efficient adiabatic nanofocusing simply by varying the gap width. For gap widths greater...
متن کاملBoosting Local Field Enhancement by on-Chip Nanofocusing and Impedance-Matched Plasmonic Antennas.
Strongly confined surface plasmon-polariton modes can be used for efficiently delivering the electromagnetic energy to nanosized volumes by reducing the cross sections of propagating modes far beyond the diffraction limit, that is, by nanofocusing. This process results in significant local-field enhancement that can advantageously be exploited in modern optical nanotechnologies, including signa...
متن کامل