Atomically flat single-crystalline gold nanostructures for plasmonic nanocircuitry.
Deep subwavelength integration of high-definition plasmonic nanostructures is of key importance in the development of future optical nanocircuitry for high-speed communication, quantum computation and lab-on-a-chip applications. To date, the experimental realization of proposed extended plasmonic networks consisting of multiple functional elements remains challenging, mainly because of the multi-crystallinity of commonly used thermally evaporated gold layers. This can produce structural imperfections in individual circuit elements that drastically reduce the yield of functional integrated nanocircuits. In this paper we demonstrate the use of large (>100 μm(2)) but thin (<80 nm) chemically grown single-crystalline gold flakes that, after immobilization, serve as an ideal basis for focused ion beam milling and other top-down nanofabrication techniques on any desired substrate. Using this methodology we obtain high-definition ultrasmooth gold nanostructures with superior optical properties and reproducible nano-sized features over micrometre-length scales. Our approach provides a possible solution to overcome the current fabrication bottleneck and realize high-definition plasmonic nanocircuitry.
Nano-Optics and Biophotonics Group, Experimentelle Physik 5, Physikalisches Institut, Wilhelm-Conrad-Röntgen-Center for Complex Material Systems, Universität Würzburg, Am Hubland, Würzburg D-97074, Germany.
Jer-Shing
JS
Huang
Victor
V
Callegari
Peter
P
Geisler
Christoph
C
Brüning
Johannes
J
Kern
Jord C
JC
Prangsma
Xiaofei
X
Wu
Thorsten
T
Feichtner
Johannes
J
Ziegler
Pia
P
Weinmann
Martin
M
Kamp
Alfred
A
Forchel
Paolo
P
Biagioni
Urs
U
Sennhauser
Bert
B
Hecht
D006046:Gold / Q000737:chemistry*; D008855:Microscopy, Electron, Scanning; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure; D036103:Nanotechnology / Q000379:methods*; D020349:Surface Plasmon Resonance
D006046:Gold
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