Dr. Bruno Paulillo Profile

Dr. Bruno Paulillo

Postdoc at ICFO - Institut de Ciències Fotòniques

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Publications (5)

Proceedings Article | 18 April 2021 Presentation

Graphene gas sensor with mid-infrared plasmons tuned by reversible chemical doping

Nestor Jr. Bareza, Bruno Paulillo, Kavitha Gopalan, Rose Alani, Valerio Pruneri

Proceedings Volume 11772, 117720W (2021) https://doi.org/10.1117/12.2588924

KEYWORDS: Graphene, Doping, Plasmons, Polymers, Mid-IR, Gas sensors, Sensors, Plasmonics, Carbon dioxide, Absorption

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Proceedings Article | 5 March 2021 Presentation

Plasmonic mid-IR gas sensing using graphene and related materials

Bruno Paulillo, Nestor Jr. Bareza, Irene Dolado, Marta Autore, Kavitha Gopalan, Rose Alani, Rainer Hillenbrand, Valerio Pruneri

Proceedings Volume 11690, 116900A (2021) https://doi.org/10.1117/12.2577468

KEYWORDS: Graphene, Mid-IR, Plasmonics, Nanostructures, Carbon dioxide, Molecules, Atmospheric optics, Adsorption, Surface plasmons, Resonance enhancement

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Proceedings Article | 14 March 2018 Presentation

III-nitride on silicon microdisks: electrical injection and bus waveguide side-coupling (Conference Presentation)

Farsane Tabataba-Vakili, Iännis Roland, Stéphanie Rennesson, Eric Frayssinet, Julien Brault, Moustafa El Kurdi, Xavier Checoury, Bruno Paulillo, Raffaele Colombelli, Thierry Guillet, Christelle Brimont, Benjamin Damilano, Fabrice Semond, Bruno Gayral, Philippe Boucaud

Proceedings Volume 10532, 105321K (2018) https://doi.org/10.1117/12.2289556

KEYWORDS: Waveguides, Silicon, Nanophotonics, Microresonators, Laser sources, Optical pumping, Electroluminescence, Quantum wells, Ultraviolet radiation, Integrated circuit design

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Proceedings Article | 27 January 2017 Paper

Sub-wavelength THz resonators for ultra-fast THz detection

B. Paulillo, S. Pirotta, S. Guilet, P. Crozat, J.-M. Manceau, N. Zerounian, A. Degiron, I. Sagnes, G. Beaudoin, G. Xu, L. Li, E. Linfield, G. Davies, R. Colombelli

Proceedings Volume 10111, 101110Q (2017) https://doi.org/10.1117/12.2251405

KEYWORDS: Terahertz radiation, Ultrafast phenomena, Quantum well infrared photodetectors, Sensors, Antennas, Resonators, Semiconductors, Terahertz detection, Inductance, Photonics

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Proceedings Article | 26 July 2016 Presentation

Room temperature strong light-matter coupling in 3D THz meta-atoms (Conference Presentation)

Bruno Paulillo, Jean-Michel Manceau, Lianhe Li, Edmund Linfield, Raffaele Colombelli

Proceedings Volume 9883, 988314 (2016) https://doi.org/10.1117/12.2225210

KEYWORDS: Capacitance, Terahertz radiation, Metamaterials, Antennas, Resonators, Polaritons, Semiconductors, Light-matter interactions, Microresonators, Inductance

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We demonstrate strong light-matter coupling at room temperature in the terahertz (THz) spectral region using 3D meta-atoms with extremely sub-wavelength volumes. Using an air-bridge fabrication scheme, we have implemented sub-wavelength 3D THz micro-resonators that rely on suspended loop antennas connected to semiconductor-filled patch cavities. We have experimentally shown that they possess the functionalities of lumped LC resonators: their frequency response can be adjusted by independently tuning the inductance associated the antenna element or the capacitance provided by the metal-semiconductor-metal cavity. Moreover, the radiation coupling and efficiency can be engineered acting on the design of the loop antenna, similarly to conventional RF antennas. Here we take advantage of this rich playground in the context of cavity electrodynamics/intersubband polaritonics. In the strong light−matter coupling regime, a cavity and a two-level system exchange energy coherently at a characteristic rate called the vacuum Rabi frequency ΩR which is dominant with respect to all other loss mechanisms involved. The signature, in the frequency domain, is the appearance of a splitting between the bare cavity and material system resonances: the new states are called upper and a lower polariton branches. So far, most experimental demonstrations of strong light−matter interaction between an intersubband transition and a deeply sub-wavelength mode in the THz or mid-infrared ranges rely on wavelength-scale or larger resonators such as photonic crystals, diffractive gratings, dielectric micro-cavities or patch cavities. Lately, planar metamaterials have been used to enhance the light-matter interaction and strongly reduce the interaction volume by engineering the electric and magnetic resonances of the individual subwavelength constituents. In this contribution we provide evidence of strong coupling between a THz intersubband transition and an extremely sub-wavelength mode (≈λ/10) within our recently developed 3D meta-atoms. A GaAs/AlGaAs parabolic quantum well is used as semiconductor active core to observe the strong coupling regime up to room temperature, as the structure ensures by design a sufficiently large useful electron population irrespective of temperature. In contrast with the previous metamaterial paradigm, the electrical dipoles responsible for the light-matter excitation are now exactly confined in the capacitive region of each meta-atom. Remarkably, we will show that we can modulate the light-matter interaction solely via the external inductor/antenna element while keeping the interaction volume (i.e. the capacitor size) unvaried. Perspectives about the exploitation of this metamaterial peculiar features (reconfigurability, dynamic tuning, …) for polaritonic devices will be discussed.

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