Prof. Javier Aizpurua Profile

Prof. Javier Aizpurua

CSIC Professor at Ctr de Fisica de Materiales

SPIE Involvement:

Conference Program Committee | Author

Proceedings Article | 3 October 2024 Presentation

Controlling the Purcell effect and the Lamb shift with nanoantenna-emitter hybrids

Javier Aizpurua, Mario Zapata, Ruben Esteban

Proceedings Volume PC13111, PC1311107 (2024) https://doi.org/10.1117/12.3027801

KEYWORDS: Quantum emitters, Quantum plasmonics, Quantum light, Nanoantennas, Quantum dot emission, Electromagnetism, Surface plasmons, Quantum statistics, Quantum regime, Quantum optics experiments

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Proceedings Article | 5 October 2023 Presentation

On-demand mid-IR to visible upconversion with a near-field microscope

Philippe Roelli, Isabel Pascual, Iris Niehues, Javier Aizpurua, Rainer Hillenbrand

Proceedings Volume PC12654, PC126540Z (2023) https://doi.org/10.1117/12.2676823

KEYWORDS: Mid-IR, Near field scanning optical microscopy, Upconversion, Microscopes, Sum frequency generation, Visible radiation, Vibration, Imaging spectroscopy, Surface properties, Spectroscopy

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Proceedings Article | 30 December 2019 Paper

Two-photon correlations in nonlinear optical systems

M. Schmidt, R. Esteban, G. Giedke, J. Aizpurua, A. Gonzalez-Tudela

Proceedings Volume 11200, 1120013 (2019) https://doi.org/10.1117/12.2541116

KEYWORDS: Photons, Nonlinear optics, Quantum information, Physics, Optical design, Quantum physics, Photonics, Nonlinear response

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Proceedings Article | 9 September 2019 Presentation

Molecular optomechanics in plasmonic nanocavities (Conference Presentation)

William Deacon, Elena Pavlenko, Tomas Neuman, Cloudy Carnegie, Javier Aizpurua, Jeremy Baumberg, Dean Kos

Proceedings Volume 11082, 1108218 (2019) https://doi.org/10.1117/12.2527884

KEYWORDS: Optomechanical design, Plasmonics, Gold, Molecules, Nanoparticles, Molecular interactions, Spherical lenses, Mirrors, Molecular self-assembly, Picosecond phenomena

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Proceedings Article | 23 May 2018 Presentation

Plasmonic nanoantennas for nanometer, picosecond, control of VO2 phase-transition (Conference Presentation)

Bigeng Chen, Otto Muskens, Daniel Traviss, Yudong Wang, C. de Groot, David Sheel, Luca Bergamini, Javier Aizpurua, Nerea Zabala, Jeffrey Gaskell

Proceedings Volume 10672, 106721V (2018) https://doi.org/10.1117/12.2307374

KEYWORDS: Modulation, Nanoantennas, Vanadium, Phase shift keying, Antennas, Gold, Spectroscopy, Dielectrics, Light harvesting, Light-matter interactions

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Single-nanoantenna has intrigued vast interest due to its exceptional properties such as light harvesting and field enhancement, which provide the opportunities for strengthening light-matter interaction and efficient photon manipulation in nano-scale, as well as boosting nonlinear response. On the other hand, materials with structural or electronic phase transition have been employed to achieve large optical modulation contrast and order-unity switching, making them promising building blocks for high-performance optical circuits and devices with ultra-small footprint. In this context we demonstrate nano-scale all-optical modulation with single Au antennas fabricated on phase-transition material vanadium dioxide (VO2) substrate. VO2 films are deposited on boroaluminosilicate glass coated with a 30-nm layer of fluorine-doped tin oxide. The inclusion of this intermediate layer allows the production of VO2 films with low surface roughness and suitable thermochromic transition temperature. Then the nanoantennas are fabricated by e-beam lithography and subsequent 45-nm-thick gold deposition on the VO2 substrate. A 5-nm-thick Ti layer is used to improve the adhesion of the gold to the VO2. We use a pump-probe spectroscopy to characterize the modulation feature of the antenna/VO2. The pump beam at 1060 nm wavelength is used to introduce a local heating for VO2's phase transition and the probe beam from 1100 nm to 2000 nm wavelength is for readout of the modulated local transmission of antenna/VO2 hybrid owing to the dielectric environment change. A spatial modulation technique is also used to extract the differential transmission (ΔT/T) around the antennas. As a result, with pump pulse energy increasing to less than 1 nJ, the measured ΔT/T of single-antenna//VO2 hybrid exhibits substantial change that crossing the zero line and significant blue shift. As reported the ΔT/T obtained from spatial modulation spectroscopy is supposed to be proportional to the antenna’s extinction cross section. However, with the obtained negative values which lead to unphysical extinction cross sections less than 0, we believe the VO2 substrate beneath the antennas is highly involved as its optical property has been modified considerately. In addition, we observe that the pump-modulated differential transmission of the antenna/VO2 hybrid evidently depends on the polarisation of the pump when it is below a certain level. In this regime, the parallel pumping excites the longitudinal resonant mode while the perpendicular one only induces non-resonant absorption of antenna’s transverse mode. Going beyond this regime, the stronger pump transits the VO2 substrate from insulating phase into metallic phase completely, which dominates the dielectric environment change of the antenna, leading to nearly polarisation-independent modulation. The time for fully switch-on obtained from the pump-probe measurement is less than 50 ps. We also investigate the time response of the differential transmission dependent on the pulse repetition rate and substrate temperature, respectively. Less modulation depth with repetition rate over 2 MHz or base temperature higher than 40 °C suggest that the heat accumulation from adjacent pulses and thermal equilibrium time plays important roles in the achievable modulation speed. The single-antenna/VO2 structure may find applications in nano-scale optoelectronics for multiple functionalities including modulation, memory and so on.

Proceedings Article | 21 September 2017 Presentation

Molecular optomechanics in plasmonic cavities (Conference Presentation)

Mikolaj Schmidt, Alejandro Gonzalez-Tudela, Geza Giedke, Tomas Neuman, Yao Zhang, Rubén Esteban, Javier Aizpurua

Proceedings Volume 10359, 103590J (2017) https://doi.org/10.1117/12.2272962

KEYWORDS: Plasmonics, Raman spectroscopy, Surface enhanced Raman spectroscopy, Optomechanical design, Raman scattering, Molecules, Molecular spectroscopy, Plasmons, Molecular interactions, Nano optics

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Proceedings Article | 22 August 2017 Paper

Strong coupling effects in hybrid plexitonic systems

Dzmitry Melnikau, Ruben Esteban, Alexander Govyadinov, Diana Savateeva, Thomas Simon, Ana Sánchez-Iglesias, Marek Grzelczak, Mikolaj Schmidt, Alexander Urban, Luis Liz-Marzán, Jochen Feldmann, Javier Aizpurua, Yury Rakovich

Proceedings Volume 10453, 104532E (2017) https://doi.org/10.1117/12.2276063

KEYWORDS: Excitons, Plasmons, Gold, Luminescence, Complex systems, Absorption spectroscopy, Magnetism, Circular dichroism spectroscopy, Molecules, Molecular spectroscopy

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Proceedings Article | 21 September 2011 Paper

Coupling of nanoparticle plasmons with molecular linkers

Nerea Zabala, Olalla Pérez-González, Peter Nordlander, Javier Aizpurua

Proceedings Volume 8096, 80961L (2011) https://doi.org/10.1117/12.893776

KEYWORDS: Plasmons, Gold, Nanoparticles, Particles, Plasmonics, Molecules, Excitons, Oscillators, Molecular electronics, Dielectrics

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Proceedings Article | 30 August 2006 Paper

Simulating electromagnetic response in coupled metallic nanoparticles for nanoscale optical microscopy and spectroscopy: nanorod-end effects

Garnett Bryant, Isabel Romero, F. Javier García de Abajo, Javier Aizpurua

Proceedings Volume 6323, 632313 (2006) https://doi.org/10.1117/12.680701

KEYWORDS: Near field, Near field optics, Spectroscopy, Nanoparticles, Gold, Antennas, Electromagnetism, Optical microscopy, Light scattering, Nanorods

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Proceedings Article | 18 June 2001 Paper

Interparticle coupling effects in surface-enhanced Raman scattering

Hongxing Xu, Erik Bjerneld, Javier Aizpurua, Peter Apell, Linda Gunnarsson, Sarunas Petronis, Bengt Kasemo, Charlotte Larsson, Fredrik Hook, Mikal Kall

Proceedings Volume 4258, (2001) https://doi.org/10.1117/12.430771

KEYWORDS: Particles, Surface enhanced Raman spectroscopy, Metals, Raman scattering, Silver, Optical spheres, Nanoparticles, Gold, Molecules, Polarization

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Showing 5 of 10 publications

Conference Committee Involvement (10)

Nonlinear Optics and Applications XIV

7 April 2025 | Prague, Czech Republic

Nonlinear Optics and Applications XIII

24 April 2023 | Prague, Czech Republic

Metamaterials XIII

19 April 2021 | Online Only, Czech Republic

Nonlinear Optics and Applications XII

19 April 2021 | Online Only, Czech Republic

Nonlinear Optics and Applications

1 April 2019 | Prague, Czech Republic

Showing 5 of 10 Conference Committees

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