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Plasmonic nano-cavities have the ability to confine light in sub-wavelength gaps. The smallest possible plasmonic nano-cavities are achieved with the nanoparticle on mirror (NPoM) configuration [1], where a flat metal substrate is separated from a nanoparticle with a thin molecular spacer, typically of 1–1.5nm thick (Fig.1a). The massive field enhancement facilitates the strong-coupling of a single...
Longitudinal antenna and transverse cavity modes can be excited when bringing a faceted plasmonic nanoparticle close to a metallic substrate. Their interaction leads to a rich optical response, understandable in terms of the modal symmetry.
The optical response of plasmonic cavities formed by metallic nanoparticles deposited on a metallic substrate separated by self-assembled monolayers of conductive organic molecules can be precisely controlled by the exact chemical composition of the monolayers.
Tuneable plasmonic devices assembled from a combination of plasmonic metals and soft polymers possess optical resonances across the visible and infrared. We demonstrate through SERS such nanostructures sequester molecules, enabling a wide variety of applications.
Novel 3D plasmonic rolls are fabricated through strain-induced self-rolling of metallic nanopore sheets attached to elastomeric thin films, with optical properties tunable by varying the size and thickness of nanopores, and dynamically by light irradiation.
SERS of sub-monolayers of benzenethiol and quantum dots are studied over a wide temperature range on plasmonic nanostructures. Unusual changes are observed in the background shape and intensity as well as the vibrational signals.
Carbon dioxide snow jets are used to eject and rearrange molecules attached to nanostructured plasmonic surfaces. Tracking the dynamics of such perturbations provides strong insight into the origin of different contributions to SERS.
Metallic nanoparticles inside metal cavities show extremely strong plasmonic field enhancement both theoretically and experimentally. Plasmonic coupling gives a universal power-law dependence on particle-surface gap, both for field enhancement and resonant wavelength shift.
Aggregation of gold nanoparticles with rigid cucurbit[5]uril molecules generates fixed inter-particle separations of 0.91 nm. These nanoparticle assemblies possess discrete plasmonic modes which elucidate nanoscale growth and serve as molecular-recognition based SERS substrates.
We report a new approach for scalable manufacturing of Metamaterials fabricated through floating and rolling-up of flexible metallodielectric stacks. Such structures have unusual nonlinear optical properties and potential superlensing applications.
Time-resolved scattering spectra of flowing polymer-based colloidal opals are presented. Broadband spectra reflecting dynamic structural changes during a shear-ordering process reveal four distinct regimes of crystal growth and decay identified under different flow conditions.
Using a new technique for single-domain shear-ordering of elastomeric photonic crystals we demonstrate novel opto-elastic properties. Tensile stress experiments demonstrate coupled mechanical and optical anisotropy, producing striking colour tuning depending on the stretch direction.
We report high-speed electronic control of ultrafast polariton amplification in a semiconductor microcavity. A >90% reduction of the parametric scattering gain is obtained by tuning the intracavity electric field to turn on inter-well resonant tunneling.
Flexible DBRs are fabricated by floating and stacking >20 bilayers of PDMS and PSPI. Stretchable microcavities between two DBRs are subsequently created with Q>60. These structures have applications as stress-strain sensors, stretch-tuneable lasers and LEDs.
Nanostructured gold surfaces with localised surface plasmon resonances are shown to produce surface-enhanced Raman scattering (SERS) of sub-monolayers of semiconducting quantum dots. These results pave the way for quantum dots use as markers.
Highly unusual thermochromic properties of large-scale shear-ordered photonic crystals are demonstrated. A simple theoretical model of the temperature dependence of this resonant Bragg scattering based structural colour is developed.
Three-dimensionally nano-structured metal surfaces containing nano-scale voids produce strong localised plasmons. We show here the correlation between physical structure and photonic and electronic properties for several significant applications.
We report the fabrication of metallic metamaterials using microstructured optical fibres as templates. The resulting fibres serve as excellent substrates for surface enhanced Raman spectroscopy and represent an exciting platform for in-fibre plasmonic devices.
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