Imperial College London

Professor Ortwin Hess

Faculty of Natural SciencesDepartment of Physics

Leverhulme Chair in Metamaterials
 
 
 
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Contact

 

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

 
 
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Location

 

806Blackett LaboratorySouth Kensington Campus

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Summary

 

Publications

Publication Type
Year
to

265 results found

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

Chikkaraddy R, Turek VA, Kongsuwan N, Benz F, Carnegie C, van de Goor T, de Nijs B, Demetriadou A, Hess O, Keyser UF, Baumberg JJet al., 2017, Mapping Nanoscale Hotspots with Single-Molecule Emitters Assembled into Plasmonic Nanocavities Using DNA Origami., Nano Lett

Fabricating nanocavities in which optically active single quantum emitters are precisely positioned is crucial for building nanophotonic devices. Here we show that self-assembly based on robust DNA-origami constructs can precisely position single molecules laterally within sub-5 nm gaps between plasmonic substrates that support intense optical confinement. By placing single-molecules at the center of a nanocavity, we show modification of the plasmon cavity resonance before and after bleaching the chromophore and obtain enhancements of ≥4 × 103 with high quantum yield (≥50%). By varying the lateral position of the molecule in the gap, we directly map the spatial profile of the local density of optical states with a resolution of ±1.5 nm. Our approach introduces a straightforward noninvasive way to measure and quantify confined optical modes on the nanoscale.

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, Vol: 4, Pages: 2410-2418, ISSN: 2330-4022

JOURNAL ARTICLE

Gric, Hess O, 2017, Surface waves supported by the nanostructured semiconductor metamaterials, Journal of Electromagnetic Waves and Applications, ISSN: 0920-5071

We discover a new kind of surface wave on semiconductor nanostructured metamaterial, which crosses the light line with a substantial portion at lower frequencies lying above the free space light line. Interestingly, the propagation of such surface wave is found to be sensitive to the parameters of the semiconductor. Furthermore, the Ferrel-Berreman modes are observed under the certain conditions, opening a gateway toward device fabrications.

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

Kongsuwan N, Demetriadou A, Chikkaraddy R, Benz F, Turek VA, Keyser UF, Baumberg JJ, Hess Oet al., 2017, Suppressed Quenching and Strong-Coupling of Purcell-Enhanced Single-Molecule Emission in Plasmonic Nanocavities, ACS Photonics, ISSN: 2330-4022

JOURNAL ARTICLE

Ren G, Yudistira D, Nguyen TG, Khodasevych I, Schoenhardt S, Berean KJ, Hamm JM, Hess O, Mitchell Aet al., 2017, Experimental demonstration of two-dimensional hybrid waveguide-integrated plasmonic crystals on silicon-on-insulator platform, APL PHOTONICS, Vol: 2, ISSN: 2378-0967

JOURNAL ARTICLE

Saba MS, Hamm JM, Baumberg JJ, Hess Oet al., 2017, Group Theoretical Route to Deterministic Weyl Points in Chiral Photonic Lattices, Physical Review Letters, Vol: 119, ISSN: 0031-9007

Topological phases derived from point degeneracies in photonic bandstructures show intriguing and unique behaviour. Previously identified band degeneracies are based on accidental degeneracies and subject to engineering on a case-by-case basis. Here we show that deterministic pseudo Weyl points with non-trivial topology and hyper-conic dispersion exist at the Brillouin zone center of chiral cubic symmetries. This conceivably allows realization of topologically protected frequencyisolated surface bands in 3D and n = 0 properties as demonstrated for a nano plasmonic system and a photonic crystal.

JOURNAL ARTICLE

Tsakmakidis KL, Hess O, Boyd RW, Zhang Xet al., 2017, Ultraslow waves on the nanoscale, SCIENCE, Vol: 358, Pages: 319-+, ISSN: 0036-8075

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

Oh SS, Wood JJ, Kim SH, Kee CS, Hess Oet al., 2016, Localized toroidal dipole moment of spoof surface plasmon polaritons

© 2015 IEEE. At infrared wavelengths, we demonstrate subwavelength scale localization of spoof surface plasmon polaritons. Based on an analytical model and numerical simulations, we show that the defect mode has toroidal dipole moment and high Q factor.

CONFERENCE PAPER

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

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