Imperial College London

Professor Ortwin Hess

Faculty of Natural SciencesDepartment of Physics

Leverhulme Chair in Metamaterials
 
 
 
//

Contact

 

+44 (0)20 7594 7586o.hess Website

 
 
//

Location

 

806Blackett LaboratorySouth Kensington Campus

//

Summary

 

Publications

Publication Type
Year
to

258 results found

Demetriadou A, Lombardi A, Mertens J, Hess O, Aizpurua J, Baumberg Jet 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.

CONFERENCE PAPER

Demetriadou A, Lombardi A, Mertens J, Hess O, Baumberg J, Aizpurua Jet 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.

CONFERENCE PAPER

Hess O, gric T, Long-range surface plasmons supported by the disordered nanowire metamaterials, Journal of Electromagnetic Waves and Applications, ISSN: 0920-5071

JOURNAL ARTICLE

Kongsuwan N, Demetriadou A, Chikkaraddy R, Benz F, Turek VA, Keyser UF, Baumberg JJ, Hess Oet 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.

JOURNAL ARTICLE

Tsakmakidis KL, Hamm JM, Pickering TW, Hess Oet 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.

JOURNAL ARTICLE

Baek IH, Hamm JM, Ahn KJ, Kang BJ, Oh SS, Bae S, Choi SY, Hong BH, Yeom D-I, Min B, Hess O, Jeong YU, Rotermund Fet al., 2017, Boosting the terahertz nonlinearity of graphene by orientation disorder, 2D MATERIALS, Vol: 4, ISSN: 2053-1583

JOURNAL ARTICLE

Bello F, Page AF, Pusch A, Hamm JM, Donegan JF, Hess Oet 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

JOURNAL ARTICLE

Choi HJ, Baek IH, Kang BJ, Kim H-D, Oh SS, Hamm JM, Pusch A, Park J, Lee K, Son J, Jeong YUK, Hess O, Rotermund F, Min Bet al., 2017, Control of terahertz nonlinear transmission with electrically gated graphene metadevices, SCIENTIFIC REPORTS, Vol: 7, ISSN: 2045-2322

JOURNAL ARTICLE

Demetriadou A, Hamm JM, Luo Y, Pendry JB, Baumberg JJ, Hess Oet al., 2017, Spatiotemporal Dynamics and Control of Strong Coupling in Plasmonic Nanocavities, ACS Photonics, ISSN: 2330-4022

JOURNAL ARTICLE

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

JOURNAL ARTICLE

Gric T, Hess O, 2017, Surface plasmon polaritons at the interface of two nanowire metamaterials, JOURNAL OF OPTICS, Vol: 19, ISSN: 2040-8978

JOURNAL ARTICLE

Kerber RM, Fitzgerald JM, Reiter DE, Oh SS, Hess Oet al., 2017, Reading the Orbital Angular Momentum of Light Using Plasmonic Nanoantennas, ACS PHOTONICS, Vol: 4, Pages: 891-896, ISSN: 2330-4022

JOURNAL ARTICLE

Kim T-T, Oh SS, Kim H-D, Park HS, Hess O, Min B, Zhang Set 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.

JOURNAL ARTICLE

Kivshar YS, Barnes WL, Hess O, Zheludev Net al., 2017, New horizons for nanophotonics., Philos Trans A Math Phys Eng Sci, Vol: 375, ISSN: 1364-503X

JOURNAL ARTICLE

Chikkaraddy R, de Nijs B, Benz F, Barrow SJ, Scherman OA, Rosta E, Demetriadou A, Fox P, Hess O, Baumberg JJet al., 2016, Single-molecule strong coupling at room temperature in plasmonic nanocavities, NATURE, Vol: 535, Pages: 127-130, ISSN: 0028-0836

JOURNAL ARTICLE

Curtin OJ, Yoshida M, Pusch A, Hylton NP, Ekins-Daukes NJ, Phillips CC, Hess Oet al., 2016, Quantum Cascade Photon Ratchets for Intermediate-Band Solar Cells, IEEE JOURNAL OF PHOTOVOLTAICS, Vol: 6, Pages: 673-678, ISSN: 2156-3381

JOURNAL ARTICLE

Dolan JA, Saba M, Dehmel R, Gunkel I, Gu Y, Wiesner U, Hess O, Wilkinson TD, Baumberg JJ, Steiner U, Wilts BDet al., 2016, Gyroid Optical Metamaterials: Calculating the Effective Permittivity of Multidomain Samples, ACS PHOTONICS, Vol: 3, Pages: 1888-1896, ISSN: 2330-4022

JOURNAL ARTICLE

Guazzotti S, Pusch A, Reiter DE, Hess Oet al., 2016, Dynamical calculation of third-harmonic generation in a semiconductor quantum well, PHYSICAL REVIEW B, Vol: 94, ISSN: 2469-9950

JOURNAL ARTICLE

Hamm JM, Page AF, Bravo-Abad J, Garcia-Vidal FJ, Hess Oet al., 2016, Nonequilibrium plasmon emission drives ultrafast carrier relaxation dynamics in photoexcited graphene, PHYSICAL REVIEW B, Vol: 93, ISSN: 1098-0121

JOURNAL ARTICLE

Hylton NP, Hinrichsen TF, Vaquero-Stainer AR, Yoshida M, Pusch A, Hopkinson M, Hess O, Phillips CC, Ekins-Daukes NJet al., 2016, Photoluminescence upconversion at GaAs/InGaP2 interfaces driven by a sequential two-photon absorption mechanism, PHYSICAL REVIEW B, Vol: 93, ISSN: 2469-9950

JOURNAL ARTICLE

Mertens J, Demetriadou A, Bowman RW, Benz F, Kleemann M-E, Tserkezis C, Shi Y, Yang HY, Hess O, Aizpurua J, Baumberg JJet al., 2016, Tracking Optical Welding through Groove Modes in Plasmonic Nanocavities, NANO LETTERS, Vol: 16, Pages: 5605-5611, ISSN: 1530-6984

JOURNAL ARTICLE

Pusch A, Yoshida M, Hylton NP, Mellor A, Phillips CC, Hess O, Ekins-Daukes NJet 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

JOURNAL ARTICLE

Pusch A, Yoshida M, Hylton NP, Mellor A, Vaquero-Steiner A, Phillips CC, Hess O, Ekins-Daukes NJet 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

CONFERENCE PAPER

Sidiropoulos TPH, Roeder R, Geburt S, Hess O, Maier SA, Ronning C, Oulton RFet 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

CONFERENCE PAPER

Baumberg J, Noginov M, Aizpurua J, Lin K, Ebbesen T, Kornyshev AA, Sapienza R, van Hulst N, Kotni S, GarcĂ­a de Abajo FJ, Ginzburg P, Hess O, Brongersma M, Bozhevolnyi Set al., 2015, Quantum plasmonics, gain and spasers: general discussion, Faraday Discuss., Vol: 178, Pages: 325-334, ISSN: 1359-6640

JOURNAL ARTICLE

Gric T, Wartak MS, Cada M, Wood JJ, Hess O, Pistora Jet al., 2015, Spoof plasmons in corrugated semiconductors, JOURNAL OF ELECTROMAGNETIC WAVES AND APPLICATIONS, Vol: 29, Pages: 1899-1907, ISSN: 0920-5071

JOURNAL ARTICLE

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

CONFERENCE PAPER

Ibbotson LA, Demetriadou A, Croxall S, Hess O, Baumberg JJet al., 2015, Optical nano-woodpiles: large-area metallic photonic crystals and metamaterials, SCIENTIFIC REPORTS, Vol: 5, ISSN: 2045-2322

JOURNAL ARTICLE

Kim S-H, Oh SS, Kim K-J, Kim J-E, Park HY, Hess O, Kee C-Set al., 2015, Subwavelength localization and toroidal dipole moment of spoof surface plasmon polaritons, PHYSICAL REVIEW B, Vol: 91, ISSN: 2469-9950

JOURNAL ARTICLE

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.

JOURNAL ARTICLE

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.

Request URL: http://wlsprd.imperial.ac.uk:80/respub/WEB-INF/jsp/search-html.jsp Request URI: /respub/WEB-INF/jsp/search-html.jsp Query String: respub-action=search.html&id=00675386&limit=30&person=true