258 results found
Demetriadou A, Lombardi A, Mertens J, et al., Anomalous spectral shifts in extreme plasmonic nano-cavities, The 10th International Congress on Advanced Electromagnetic Materials in Microwaves and Optics (Metamaterials 2016)
Nanoplasmonics have the ability to confine light in sub-wavelength cavities, with recentnano-fabrication developments allowing for the realization of nanometer and sub-nanometerplasmonic cavities. We show that for such extremely small nano-cavities, the correlation betweenthe field enhancement resonance and the radiative (far-field) resonance breaks down. This dissociationdominated the excitation and interference of higher-order modes in these nano-cavities.We discuss and demonstrate the impact of this anomalous spectral behaviour for the strongcoupling of quantum emitters with plasmonic nano-cavities, where it is imperative to have nanosizedcavities.
Demetriadou A, Lombardi A, Mertens J, et al., Anomalous spectral shifts in plasmonic nano-cavities, META’16, The 7th International Conference on Metamaterials, Photonic Crystals and Plasmonics (invited)
Nanoplasmonics have the ability to confine light in extremely small nano-cavities.We show using a theoretical model, numerical calculations and measurements that for thesetightly-coupled nanoplasmonic structures, the correlation between the field enhancement (near-field) resonance and the radiative (far-field) resonance breaks down. This dissociation is determinedby the nanocavity’s geometry. The anomalous behaviour of plasmonic nanocavities isof significant importance for active and quantum plasmonics, where extreme nano-cavities areessential to observe strong coupling.
Hess O, gric T, Long-range surface plasmons supported by the disordered nanowire metamaterials, Journal of Electromagnetic Waves and Applications, ISSN: 0920-5071
Kongsuwan N, Demetriadou A, Chikkaraddy R, et al., Suppressed Quenching and Strong Coupling of Purcell-Enhanced Single-Molecule Emission in Plasmonic Nanocavities
An emitter in the vicinity of a metal nanostructure is quenched by its decaythrough non-radiative channels, leading to the belief in a zone of inactivityfor emitters placed within $<$10nm of a plasmonic nanostructure. Here wedemonstrate that in tightly-coupled plasmonic resonators forming nanocavities"quenching is quenched" due to plasmon mixing. Unlike isolated nanoparticles,plasmonic nanocavities show mode hybridization which massively enhances emitterexcitation and decay via radiative channels. This creates ideal conditions forrealizing single-molecule strong-coupling with plasmons, evident in dynamicRabi-oscillations and experimentally confirmed by laterally dependent emitterplacement through DNA-origami.
Tsakmakidis KL, Hamm JM, Pickering TW, et al., Plasmonic Nanolasers Without Cavity, Threshold and Diffraction Limit using Stopped Light
We present a plasmonic waveguide where light pulses are stopped atwell-accessed complex-frequency zero-group-velocity points. Introducing gain atsuch points results in cavity-free, "thresholdless" nanolasers beating thediffraction limit via a novel, stopped-light mode-locking mechanism.
Baek IH, Hamm JM, Ahn KJ, et al., 2017, Boosting the terahertz nonlinearity of graphene by orientation disorder, 2D MATERIALS, Vol: 4, ISSN: 2053-1583
Bello F, Page AF, Pusch A, et al., 2017, Combining epsilon-Near-Zero Behavior and Stopped Light Energy Bands for Ultra-Low Reflection and Reduced Dispersion of Slow Light, SCIENTIFIC REPORTS, Vol: 7, ISSN: 2045-2322
Choi HJ, Baek IH, Kang BJ, et al., 2017, Control of terahertz nonlinear transmission with electrically gated graphene metadevices, SCIENTIFIC REPORTS, Vol: 7, ISSN: 2045-2322
Demetriadou A, Hamm JM, Luo Y, et al., 2017, Spatiotemporal Dynamics and Control of Strong Coupling in Plasmonic Nanocavities, ACS Photonics, ISSN: 2330-4022
Gric T, Hess O, 2017, Tunable surface waves at the interface separating different graphene-dielectric composite hyperbolic metamaterials, OPTICS EXPRESS, Vol: 25, Pages: 11466-11476, ISSN: 1094-4087
Gric T, Hess O, 2017, Surface plasmon polaritons at the interface of two nanowire metamaterials, JOURNAL OF OPTICS, Vol: 19, ISSN: 2040-8978
Kerber RM, Fitzgerald JM, Reiter DE, et al., 2017, Reading the Orbital Angular Momentum of Light Using Plasmonic Nanoantennas, ACS PHOTONICS, Vol: 4, Pages: 891-896, ISSN: 2330-4022
Kim T-T, Oh SS, Kim H-D, et al., 2017, Electrical access to critical coupling of circularly polarized waves in graphene chiral metamaterials., Sci Adv, Vol: 3
Active control of polarization states of electromagnetic waves is highly desirable because of its diverse applications in information processing, telecommunications, and spectroscopy. However, despite the recent advances using artificial materials, most active polarization control schemes require optical stimuli necessitating complex optical setups. We experimentally demonstrate an alternative-direct electrical tuning of the polarization state of terahertz waves. Combining a chiral metamaterial with a gated single-layer sheet of graphene, we show that transmission of a terahertz wave with one circular polarization can be electrically controlled without affecting that of the other circular polarization, leading to large-intensity modulation depths (>99%) with a low gate voltage. This effective control of polarization is made possible by the full accessibility of three coupling regimes, that is, underdamped, critically damped, and overdamped regimes by electrical control of the graphene properties.
Chikkaraddy R, de Nijs B, Benz F, et al., 2016, Single-molecule strong coupling at room temperature in plasmonic nanocavities, NATURE, Vol: 535, Pages: 127-130, ISSN: 0028-0836
Curtin OJ, Yoshida M, Pusch A, et al., 2016, Quantum Cascade Photon Ratchets for Intermediate-Band Solar Cells, IEEE JOURNAL OF PHOTOVOLTAICS, Vol: 6, Pages: 673-678, ISSN: 2156-3381
Dolan JA, Saba M, Dehmel R, et al., 2016, Gyroid Optical Metamaterials: Calculating the Effective Permittivity of Multidomain Samples, ACS PHOTONICS, Vol: 3, Pages: 1888-1896, ISSN: 2330-4022
Guazzotti S, Pusch A, Reiter DE, et al., 2016, Dynamical calculation of third-harmonic generation in a semiconductor quantum well, PHYSICAL REVIEW B, Vol: 94, ISSN: 2469-9950
Hamm JM, Page AF, Bravo-Abad J, et al., 2016, Nonequilibrium plasmon emission drives ultrafast carrier relaxation dynamics in photoexcited graphene, PHYSICAL REVIEW B, Vol: 93, ISSN: 1098-0121
Hylton NP, Hinrichsen TF, Vaquero-Stainer AR, et al., 2016, Photoluminescence upconversion at GaAs/InGaP2 interfaces driven by a sequential two-photon absorption mechanism, PHYSICAL REVIEW B, Vol: 93, ISSN: 2469-9950
Mertens J, Demetriadou A, Bowman RW, et al., 2016, Tracking Optical Welding through Groove Modes in Plasmonic Nanocavities, NANO LETTERS, Vol: 16, Pages: 5605-5611, ISSN: 1530-6984
Pusch A, Yoshida M, Hylton NP, et al., 2016, Limiting efficiencies for intermediate band solar cells with partial absorptivity: the case for a quantum ratchet, PROGRESS IN PHOTOVOLTAICS, Vol: 24, Pages: 656-662, ISSN: 1062-7995
Pusch A, Yoshida M, Hylton NP, et al., 2016, The Purpose of a Photon Ratchet in Intermediate Band Solar Cells, 43rd IEEE Photovoltaic Specialists Conference (PVSC), Publisher: IEEE, Pages: 9-12, ISSN: 0160-8371
Sidiropoulos TPH, Roeder R, Geburt S, et al., 2016, Ultrafast ZnO nanowire lasers: nanoplasmonic acceleration of gain dynamics at the surface plasmon polariton frequency, Conference on Lasers and Electro-Optics (CLEO), Publisher: IEEE, ISSN: 2160-9020
Baumberg J, Noginov M, Aizpurua J, et al., 2015, Quantum plasmonics, gain and spasers: general discussion, Faraday Discuss., Vol: 178, Pages: 325-334, ISSN: 1359-6640
Hess O, 2015, Cavity-free stopped-light nanolasing in nanoplasmonic heterostructures, Conference on Active Photonic Materials VII, Publisher: SPIE-INT SOC OPTICAL ENGINEERING, ISSN: 0277-786X
Ibbotson LA, Demetriadou A, Croxall S, et al., 2015, Optical nano-woodpiles: large-area metallic photonic crystals and metamaterials, SCIENTIFIC REPORTS, Vol: 5, ISSN: 2045-2322
Kim S-H, Oh SS, Kim K-J, et al., 2015, Subwavelength localization and toroidal dipole moment of spoof surface plasmon polaritons, PHYSICAL REVIEW B, Vol: 91, ISSN: 2469-9950
Oh SS, Hess O, 2015, Chiral metamaterials: enhancement and control of optical activity and circular dichroism., Nano Converg, Vol: 2, ISSN: 2196-5404
The control of the optical activity and ellipticity of a medium has drawn considerable attention due to the recent developments in metamaterial design techniques and a deeper understanding of the light matter interaction in composite metallic structures. Indeed, recently proposed designs of metaatoms have enabled the realisation of materials with unprecedented chiral optical properties e.g. strong optical activity, broadband optical activity, and nondispersive zero ellipticity. Combining chiral metamaterials with nonlinear materials has opened up new possibilities in the field of nonlinear chirality as well as provided the foundation for switchable chiral devices. Furthermore, chirality together with hyperbolicity can be used to realise new exciting materials such as photonic topological insulators. In this review, we will outline the fundamental principles of chiral metamaterials and report on recent progress in providing the foundations for promising applications of switchable chiral metamaterials.
This data is extracted from the Web of Science and reproduced under a licence from Thomson Reuters. You may not copy or re-distribute this data in whole or in part without the written consent of the Science business of Thomson Reuters.