Prof. Bert Hecht Profile

Prof. Bert Hecht

at Univ of Wuerzburg

SPIE Involvement:

Author

Proceedings Article | 24 May 2022 Presentation

Coherent modulation of the nonlinear emission of a plasmonic nanoantenna by dual-beam pumping

Attilio Zilli, Andrea Locatelli, Agostino Di Francescantonio, Xiaofei Wu, Thorsten Feichtner, Paolo Biagioni, Costantino De Angelis, Bert Hecht, Marco Finazzi, Michele Celebrano

Proceedings Volume PC12131, PC1213107 (2022) https://doi.org/10.1117/12.2621333

KEYWORDS: Modulation, Plasmonics, Nanoantennas, Nonlinear optics, Gold, Electromagnetism, Dielectrics, Complex systems, Visibility, Ultrafast phenomena

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The ongoing drive towards the miniaturization of nonlinear optics is motivated by the number of functionalities it could bring about in integrated devices, such as frequency conversion, information processing, and holography. The main hindrance to the technological deployment of nonlinear optics is the perturbative character of nonlinear interactions, whose intrinsic weakness is compounded at the nanoscale by the small volume of matter involved. The exploitation of the resonant electromagnetic modes supported by nanostructures in order to increase the strength of light–matter coupling is therefore a thriving area of research. In this work, we investigate gold dimers, where a V-antenna tuned to resonate at a telecom frequency ω (corresponding to a 1550 nm wavelength) is electromagnetically coupled to a rod resonating at 2ω. The structures were patterned lithographically out of a 40 nm-thick monocrystalline gold flake with a focused-ion (Ga) beam. In our experiment, a pump pulse at ω is mixed with its frequency-doubled replica, resulting in SFG at frequency ω+2ω = 3ω. A thorough experimental characterization discloses a rich phenomenology as the SFG is ruled by the resonant response. Such sensitive dependence on the geometry of the system and the excitation is unraveled through a systematic comparison to full-vectorial numerical simulations. In our dimers, on the one hand the doubly resonant design boosts both pumps of the SFG; on the other hand, the non-centrosymmetric shape allows interference of SFG with third-harmonic generation (THG), which also occurs at ω+ω+ω = 3ω. Delay traces of the signal at 3ω exhibit strong interference fringes (power modulation above 400%) with a 2ω periodicity. The small dephasing between pumps required to achieve such sizable modulation can be imparted by either mechanical or electro-optic means; along with the instantaneous (electronic) character of the materials response, this suggests enticing perspectives for ultrafast modulation and coherent control.

Proceedings Article | 20 August 2020 Presentation

Electrically-driven Plasmonics

Bert Hecht, René Kullock, Max Ochs, Philipp Grimm, Luka Zurak, Patrick Pertsch, Daniel Friedrich, Jessica Meier, Benedikt Schurr, Monika Emmerling

Proceedings Volume 11462, 114620Q (2020) https://doi.org/10.1117/12.2568370

KEYWORDS: Plasmonics, Plasmons, Electrons, Multi-element lenses, Antennas, Nano light sources, Photonics

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Proceedings Article | 1 April 2020 Presentation

Enhancing and switching harmonic generation in plasmonic and dielectric nanoantennas (Conference Presentation)

Lavinia Ghirardini, Eva Aurelia Arianna Pogna, Attilio Zilli, Paolo Biagioni, Lamberto Duò, Giovanni Pellegrini, Francesco Rusconi, Andrea Locatelli, Luca Carletti, Davide Rocco, Carlo Gigli, Giuseppe Marino, Aristide Lemaître, Andrea Mazzanti, Giuseppe Della Valle, Xiaofei Wu, Bert Hecht, Giulio Cerullo, Giuseppe Leo, Costantino De Angelis, Marco Finazzi, Michele Celebrano

Proceedings Volume 11344, 113440J (2020) https://doi.org/10.1117/12.2554643

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Nanoscale optical integration is nowadays a strategic technological challenge and the ability of generating and manipulating nonlinear optical processes in sub-wavelength volumes is pivotal to realize efficient sensing probes and photonic sources for the next-generation communication technologies. Yet, confining nonlinear processes below the diffraction limit remains a challenging task because phase-matching is not a viable approach at the nanoscale. The localized fields associated to the resonant modes of plasmonic and dielectric nanoantennas offer a route to enhance and control nonlinear processes in highly confined volumes. In my talk I will discuss two nonlinear platforms based on plasmonic and dielectric nanostructures. The first relies on a broken symmetry antenna design, which brings about an efficient second harmonic generation (SHG). We recently applied this concept to an extended array of non-centrosymmetric nanoantennas for sensing applications. I will also show the evidence of a cascaded second-order process in Third Harmonic Generation (THG) in these nanoantennas. Recently, dielectric nanoantennas emerged as an alternative to plasmonic nanostructures for nanophotonics applications, thanks to their sharp magnetic and electric Mie resonances along with the low ohmic losses in the visible/near-infrared region of the spectrum. I will present our most recent studies on the nonlinear properties of AlGaAs dielectric nanopillars. The strong localized modes along with the broken symmetry in the crystal structure of AlGaAs allow obtaining more than two orders of magnitude higher SHG efficiency with respect to plasmonic nanoantennas with similar spatial footprint and using the same pump power. I will also discuss a few key strategies we recently adopted to optically switch the SHG in these antennas even on the ultrafast time scale. Finally, I will show how to effectively engineer the sum frequency generation via the Mie resonances in these nanoantennas. These results draw a viable blueprint towards room-temperature all optical logic operation at the nanoscale.

Proceedings Article | 14 March 2018 Presentation

Competing second and third order nonlinear effects in plasmonic nanoantennas (Conference Presentation)

Costantino De Angelis, Michele Celebrano, Lavinia Ghirardini, Giovanni Pellegrini, Paolo Biagioni, Xiaofei Wu, Swen Grossmann, Luca Carletti, Andrea Locatelli, Lamberto Duò, Bert Hecht, Marco Finazzi

Proceedings Volume 10540, 105400U (2018) https://doi.org/10.1117/12.2288377

KEYWORDS: Nanoantennas, Second-harmonic generation, Plasmonics, Imaging spectroscopy, Nanophotonics, Photon polarization, Nonlinear optics, Nanostructures, Electromagnetism, Light sources

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Proceedings Article | 26 January 2018 Paper

Directed emission by electrically driven optical antennas

René Kullock, Philipp Grimm, Maximilian Ochs, Bert Hecht

Proceedings Volume 10540, 1054012 (2018) https://doi.org/10.1117/12.2289647

KEYWORDS: Antennas, Particles, Optical antennas, Gold, Surface plasmons, Electroluminescence

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Proceedings Article | 7 February 2012 Paper

Dynamics of two-photon photoluminescence in gold nanostructures

P. Biagioni, D. Brida, J.-S. Huang, J. Kern, L. Duò, B. Hecht, M. Finazzi, G. Cerullo

Proceedings Volume 8245, 824504 (2012) https://doi.org/10.1117/12.908498

KEYWORDS: Gold, Luminescence, Nanostructures, Picosecond phenomena, Absorption, Plasmonics, Objectives, Second-harmonic generation, Confocal microscopy, Nanorods

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Proceedings Article | 22 February 2011 Paper

Tailoring the interaction between matter and polarized light with plasmonic optical antennas

P. Biagioni, X. Wu, M. Savoini, J. Ziegler, J.-S. Huang, L. Duò, M. Finazzi, B. Hecht

Proceedings Volume 7922, 79220C (2011) https://doi.org/10.1117/12.876571

KEYWORDS: Antennas, Polarization, Dielectric polarization, Near field, Plasmonics, Optical antennas, Prototyping, Gold, Scanning electron microscopy, Nanoantennas

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Proceedings Article | 6 September 1995 Paper

Tunnel near-field optical microscopy (TNOM-2)

Bert Hecht, Dieter Pohl, Harry Heinzelmann, Lukas Novotny

Proceedings Volume 2535, (1995) https://doi.org/10.1117/12.218689

KEYWORDS: Near field scanning optical microscopy, Near field, Optical microscopy, Near field optics, Glasses, Metals, Polarization, Scanning tunneling microscopy, Optical microscopes, Objectives

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SPIE Journal Paper | 1 August 1995

Scanning near-field optical microscopy in Basel, Ruschlikon, and Zurich

Harry Heinzelmann, Thomas Huser, Thilo Lacoste, Hans-Joachim Guentherodt, Dieter Pohl, Bert Hecht, Lukas Novotny, Olivier Martin, Christian Hafner, Heinrich Baggenstos, Urs Wild, Alois Renn

OE, Vol. 34, Issue 08, (August 1995) https://doi.org/10.1117/12.10.1117/12.205670

KEYWORDS: Near field scanning optical microscopy, Optical microscopy, Near field, Near field optics

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Showing 5 of 9 publications

Conference Committee Involvement (2)

Nanophotonics, Nanostructure, and Nanometrology II

12 November 2007 | Beijing, China

Nanophotonics, Nanostructure, and Nanometrology

8 November 2004 | Beijing, China

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