Self-Aligned Colloidal Lithography for Controllable and Tuneable Plasmonic Nanogaps
نویسندگان
چکیده
Au nanoparticles (NPs) deposited on a substrate function as ring shaped colloidal shadow masks. Using e-beam evaporation of gold, nanometer sized gaps are formed as a result. The size of these gaps can be accurately tuned by controlling the thickness of the gold deposition, thereby tuning the plasmonic coupling of the NPs with the substrate. The clean cavity produced between the Au NPs and the Au film provides an excellent SERS platform for trace molecule detection.
منابع مشابه
Shrinking-hole colloidal lithography: self-aligned nanofabrication of complex plasmonic nanoantennas.
Plasmonic nanoantennas create locally strongly enhanced electric fields in so-called hot spots. To place a relevant nanoobject with high accuracy in such a hot spot is crucial to fully capitalize on the potential of nanoantennas to control, detect, and enhance processes at the nanoscale. With state-of-the-art nanofabrication, in particular when several materials are to be used, small gaps betwe...
متن کاملRepetitive Hole-Mask Colloidal Lithography for the Fabrication of Large-Area Low-Cost Plasmonic Multishape Single-Layer Metasurfaces
Nanostructuring for tailored optical functionality suffers from a lack of methods for large-area and low-cost fabrication. While electron beam lithography allows different complex shapes to be deposited onto the same substrate layer, the writing process is sequential and the fabrication is very expensive. Large-area methods, such as nanosphere lithography, [ 1 ] colloidal lithography using shad...
متن کاملPlasmonic structures fabricated via nanomasking sub-10 nm lithography technique
Making use of a newly established nanomasking technique, nanoscale features (sub-10 nm) have been fabricated with the potential to act as plasmonic enhancement structures. The technique makes use of a two-step lithography process to simultaneously produce many plasmonic hotspots with two-dimensional features over a large area, showing promise for mass production scalability. This technique is h...
متن کاملM-shaped grating by nanoimprinting: a replicable, large-area, highly active plasmonic surface-enhanced Raman scattering substrate with nanogaps.
Plasmonic nanostructures separated by nanogaps enable strong electromagnetic-field confinement on the nanoscale for enhancing light-matter interactions, which are in great demand in many applications such as surface-enhanced Raman scattering (SERS). A simple M-shaped nanograting with narrow V-shaped grooves is proposed. Both theoretical and experimental studies reveal that the electromagnetic f...
متن کاملSingle-molecule Detection in Nanogap- embedded Plasmonic Gratings
We introduce nanogap-embedded silver plasmonic gratings for single-molecule (SM) visualization using an epifluorescence microscope. This silver plasmonic plat‐ form was fabricated by a cost-effective nano-imprint lithography technique, using an HD DVD template. DNA/ RNA duplex molecules tagged with Cy3/Cy5 fluorophores were immobilized on SiO2-capped silver gratings. Light was coupled to the gr...
متن کامل