λ3/1000 Plasmonic Nanocavities for Biosensing Fabricated by Soft UV Nanoimprint Lithography

Arrays of plasmonic nanocavities with very low volumes, down to λ3/1000, have been fabricated by soft UV nanoimprint lithography. Nearly perfect omnidirectional absorption (3–70°) is demonstrated for the fundamental mode of the cavity (λ ≃ 1.15 μm). The second-order mode exhibits a sharper resonance...

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Bibliographic Details
Published in:Nano letters 2011-09, Vol.11 (9), p.3557-3563
Main Authors: Cattoni, Andrea, Ghenuche, Petru, Haghiri-Gosnet, Anne-Marie, Decanini, Dominique, Chen, Jing, Pelouard, Jean-Luc, Collin, Stéphane
Format: Article
Language:English
Subjects:
Absorption
Biosensing Techniques
Biotechnology - methods
Collective excitations (including excitons, polarons, plasmons and other charge-density excitations)
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Cross-disciplinary physics: materials science
rheology
Electronic structure and electrical properties of surfaces, interfaces, thin films and low-dimensional structures
Equipment Design
Exact sciences and technology
Fullerenes and related materials
General equipment and techniques
Instruments, apparatus, components and techniques common to several branches of physics and astronomy
Materials science
Methods of nanofabrication
Nanostructures - chemistry
Nanotechnology - methods
Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation
Optics and Photonics
Physics
Refractometry
Semiconductors
Sensors (chemical, optical, electrical, movement, gas, etc.)
remote sensing
Surface and interface electron states
Surface Plasmon Resonance - methods
Ultraviolet Rays
Visible and ultraviolet spectra
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Summary:Arrays of plasmonic nanocavities with very low volumes, down to λ3/1000, have been fabricated by soft UV nanoimprint lithography. Nearly perfect omnidirectional absorption (3–70°) is demonstrated for the fundamental mode of the cavity (λ ≃ 1.15 μm). The second-order mode exhibits a sharper resonance with strong angular dependence and total optical absorption when the critical coupling condition is fulfilled (45–50°, λ ≃ 750 nm). It leads to high refractive index sensitivity (405 nm/RIU) and figure of merit (∼21) and offers new perspectives for efficient biosensing experiments in ultralow volumes.
ISSN:1530-6984
1530-6992
DOI:10.1021/nl201004c