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Silvestri M, Venturi M, Di Muzio M, Adhikary R, Ferrante C, Benassi P, Marini A. Harnessing collisional nonlinearity for enhanced harmonic generation by ultraviolet plasmonic nanoparticles. J Chem Phys 2024; 161:054111. [PMID: 39092943 DOI: 10.1063/5.0210865] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2024] [Accepted: 07/10/2024] [Indexed: 08/04/2024] Open
Abstract
We investigate the contribution of inelastic electron collisions to nonlinear (NL) dynamics in ultraviolet plasmonic nanoparticles, exploring their potential for harmonic generation. Employing the Landau weak coupling formalism to model radiation-driven electron dynamics in sodium and aluminum, we account for both electron-electron and electron-phonon scattering processes by a set of hydrodynamic equations, which we solve perturbatively to obtain third-order NL susceptibilities. Furthermore, we model high harmonic generation enhanced by localized surface plasmons in nanospheres composed of such poor metals, demonstrating their efficient operation for extreme ultraviolet generation. Our investigation reveals that plasmonic nanospheres composed of sodium and aluminum produce a large field intensity enhancement of ≃103-105, boosting the harmonic generation process. Our findings indicate that poor metals hold great promise for advanced extreme ultraviolet nano-sources with potential applications in nano-spectroscopy.
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Affiliation(s)
- Matteo Silvestri
- Department of Physical and Chemical Sciences, University of L'Aquila, Via Vetoio, 67100 L'Aquila, Italy
| | - Matteo Venturi
- Department of Physical and Chemical Sciences, University of L'Aquila, Via Vetoio, 67100 L'Aquila, Italy
| | - Mattia Di Muzio
- Department of Physical and Chemical Sciences, University of L'Aquila, Via Vetoio, 67100 L'Aquila, Italy
| | - Raju Adhikary
- Department of Physical and Chemical Sciences, University of L'Aquila, Via Vetoio, 67100 L'Aquila, Italy
| | - Carino Ferrante
- CNR-SPIN, c/o Dip.to di Scienze Fisiche e Chimiche, Via Vetoio, Coppito (L'Aquila) 67100, Italy
| | - Paola Benassi
- Department of Physical and Chemical Sciences, University of L'Aquila, Via Vetoio, 67100 L'Aquila, Italy
- CNR-SPIN, c/o Dip.to di Scienze Fisiche e Chimiche, Via Vetoio, Coppito (L'Aquila) 67100, Italy
| | - Andrea Marini
- Department of Physical and Chemical Sciences, University of L'Aquila, Via Vetoio, 67100 L'Aquila, Italy
- CNR-SPIN, c/o Dip.to di Scienze Fisiche e Chimiche, Via Vetoio, Coppito (L'Aquila) 67100, Italy
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Ferrante C, Principi E, Marini A, Batignani G, Fumero G, Virga A, Foglia L, Mincigrucci R, Simoncig A, Spezzani C, Masciovecchio C, Scopigno T. Non-linear self-driven spectral tuning of Extreme Ultraviolet Femtosecond Pulses in monoatomic materials. LIGHT, SCIENCE & APPLICATIONS 2021; 10:92. [PMID: 33911069 PMCID: PMC8080687 DOI: 10.1038/s41377-021-00531-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/11/2020] [Revised: 03/23/2021] [Accepted: 04/07/2021] [Indexed: 06/12/2023]
Abstract
Self-action nonlinearity is a key aspect - either as a foundational element or a detrimental factor - of several optical spectroscopies and photonic devices. Supercontinuum generation, wavelength converters, and chirped pulse amplification are just a few examples. The recent advent of Free Electron Lasers (FEL) fostered building on nonlinearity to propose new concepts and extend optical wavelengths paradigms for extreme ultraviolet (EUV) and X-ray regimes. No evidence for intrapulse dynamics, however, has been reported at such short wavelengths, where the light-matter interactions are ruled by the sharp absorption edges of core electrons. Here, we provide experimental evidence for self-phase modulation of femtosecond FEL pulses, which we exploit for fine self-driven spectral tunability by interaction with sub-micrometric foils of selected monoatomic materials. Moving the pulse wavelength across the absorption edge, the spectral profile changes from a non-linear spectral blue-shift to a red-shifted broadening. These findings are rationalized accounting for ultrafast ionization and delayed thermal response of highly excited electrons above and below threshold, respectively.
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Affiliation(s)
- Carino Ferrante
- Graphene Labs, Istituto Italiano di Tecnologia, Via Morego 30, 16163, Genova, Italy.
- Center for Life Nano Science @Sapienza, Istituto Italiano di Tecnologia, Viale Regina Elena 291, I-00161, Roma, Italy.
- Dipartimento di Fisica, Università di Roma "La Sapienza", Piazzale Aldo Moro 5, 00185, Roma, Italy.
| | - Emiliano Principi
- Elettra-Sincrotrone Trieste S.C.p.A., SS 14-km 163.5, 34149, Basovizza, Trieste, Italy
| | - Andrea Marini
- Dipartimento di Scienze Fisiche e Chimiche, Università degli Studi dell'Aquila, Via Vetoio, 67100, L'Aquila, Italy
| | - Giovanni Batignani
- Dipartimento di Fisica, Università di Roma "La Sapienza", Piazzale Aldo Moro 5, 00185, Roma, Italy
| | - Giuseppe Fumero
- Dipartimento di Fisica, Università di Roma "La Sapienza", Piazzale Aldo Moro 5, 00185, Roma, Italy
| | - Alessandra Virga
- Center for Life Nano Science @Sapienza, Istituto Italiano di Tecnologia, Viale Regina Elena 291, I-00161, Roma, Italy
| | - Laura Foglia
- Elettra-Sincrotrone Trieste S.C.p.A., SS 14-km 163.5, 34149, Basovizza, Trieste, Italy
| | - Riccardo Mincigrucci
- Elettra-Sincrotrone Trieste S.C.p.A., SS 14-km 163.5, 34149, Basovizza, Trieste, Italy
| | - Alberto Simoncig
- Elettra-Sincrotrone Trieste S.C.p.A., SS 14-km 163.5, 34149, Basovizza, Trieste, Italy
| | - Carlo Spezzani
- Elettra-Sincrotrone Trieste S.C.p.A., SS 14-km 163.5, 34149, Basovizza, Trieste, Italy
| | - Claudio Masciovecchio
- Elettra-Sincrotrone Trieste S.C.p.A., SS 14-km 163.5, 34149, Basovizza, Trieste, Italy
| | - Tullio Scopigno
- Graphene Labs, Istituto Italiano di Tecnologia, Via Morego 30, 16163, Genova, Italy.
- Center for Life Nano Science @Sapienza, Istituto Italiano di Tecnologia, Viale Regina Elena 291, I-00161, Roma, Italy.
- Dipartimento di Fisica, Università di Roma "La Sapienza", Piazzale Aldo Moro 5, 00185, Roma, Italy.
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