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Rasmussen M, Nagy O, Skupin S, Stathopulos A, Bergé L, Jepsen PU, Zhou B. Frequency-resolved characterization of broadband two-color air-plasma terahertz beam profiles. Opt Express 2023; 31:9287-9298. [PMID: 37157501 DOI: 10.1364/oe.482995] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/10/2023]
Abstract
The frequency-resolved terahertz (THz) beam profile characteristics of a two-color air-plasma THz source were investigated in the broadband frequency range (1-15 THz). The frequency resolution is achieved by combining THz waveform measurements and the knife-edge technique. Our results show that the THz focal spot size is strongly frequency dependent. This has important implications on nonlinear THz spectroscopy applications where accurate knowledge of the applied THz electrical field strength onto the sample is important. In addition, the transition between the solid and hollow beam profile of the air-plasma THz beam was carefully identified. Far from the focus, the features across the 1-15 THz range have also been carefully examined, revealing the characteristic conical emission patterns at all frequencies.
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Nilforoushan N, Apretna T, Song C, Boulier T, Tignon J, Dhillon S, Hanna M, Mangeney J. Ultra-broadband THz pulses with electric field amplitude exceeding 100 kV/cm at a 200 kHz repetition rate. Opt Express 2022; 30:15556-15565. [PMID: 35473272 DOI: 10.1364/oe.453105] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/11/2022] [Accepted: 04/08/2022] [Indexed: 06/14/2023]
Abstract
We demonstrate a table-top source delivering ultra-broadband THz pulses with electric field strength exceeding 100 kV/cm at a repetition rate of 200 kHz. The source is based on optical rectification of 23 fs pulses at 1030 nm delivered by a ytterbium-doped fiber laser followed by a nonlinear temporal compression stage. We generate THz pulses with a conversion efficiency of up to 0.11 % with a spectrum extending to 11 THz using a 1 mm thick GaP crystal and a conversion efficiency of 0.016 % with a spectrum extending to 30 THz using a 30 µm thick GaSe crystal. The essential features of the emitted THz pulse spectra are well captured by simulations of the optical rectification process relying on coupled nonlinear equations. Our ultrafast laser-based source uniquely satisfies an important requirement of nonlinear THz experiments, namely the emission of ultra-broadband THz pulses with high electric field amplitudes at high repetition rates, opening a route towards nonlinear time-resolved THz experiments with high signal-to-noise ratios.
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Dupas C, Guillemet-Fritsch S, Geffroy PM, Chartier T, Baillergeau M, Mangeney J, Roux JF, Ganne JP, Marcellin S, Degiron A, Akmansoy É. High permittivity processed SrTiO 3 for metamaterials applications at terahertz frequencies. Sci Rep 2018; 8:15275. [PMID: 30323212 PMCID: PMC6189093 DOI: 10.1038/s41598-018-33251-y] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2018] [Accepted: 09/24/2018] [Indexed: 11/09/2022] Open
Abstract
High permittivity SrTiO3 for the realization of all-dielectric metamaterials operating at terahertz frequencies was fabricated. A comparison of different processing methods demonstrates that Spark Plasma Sintering is the most effective sintering process to yield high density ceramic with high permittivity. We compare this sintering process with two other processes. The fabricated samples are characterized in the low frequency and in the terahertz frequency ranges. Their relative permittivities are compared with that of a reference SrTiO3 single crystal. The permittivity of the sample fabricated by Spark Plasma Sintering is as high as that of the single crystal. The role of the signal-to-noise ratio in the measurements at terahertz frequency is detailed.
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Affiliation(s)
- Cyrielle Dupas
- Univ Limoges, CNRS, SPCTS UMR 7315, Ctr Europeen Ceram, F-87068, Limoges, France.,CIRIMAT, Université de Toulouse, CNRS, INP, UPS, F-31062, Toulouse, France
| | | | - Pierre-Marie Geffroy
- Univ Limoges, CNRS, SPCTS UMR 7315, Ctr Europeen Ceram, F-87068, Limoges, France
| | - Thierry Chartier
- Univ Limoges, CNRS, SPCTS UMR 7315, Ctr Europeen Ceram, F-87068, Limoges, France
| | - Matthieu Baillergeau
- Univ Paris 06, Univ D. Diderot, CNRS, Ecole Normale Super, Lab Pierre Aigrain, UMR 8551, F-75231, Paris 05, France
| | - Juliette Mangeney
- Univ Paris 06, Univ D. Diderot, CNRS, Ecole Normale Super, Lab Pierre Aigrain, UMR 8551, F-75231, Paris 05, France
| | - Jean-François Roux
- IMEP - LaHC UMR 5130, Université Savoie Mont-Blanc, F73376, Le Bourget du Lac, France
| | - Jean-Pierre Ganne
- Thales Research & Technology, Route Départementale 128, 91767, Palaiseau Cedex, France
| | - Simon Marcellin
- Institut d'Électronique Fondamentale, Univ. Paris-Sud, Université Paris-Saclay, Orsay, F-91405; UMR8622, CNRS, Orsay, F 91405, France
| | - Aloyse Degiron
- Institut d'Électronique Fondamentale, Univ. Paris-Sud, Université Paris-Saclay, Orsay, F-91405; UMR8622, CNRS, Orsay, F 91405, France
| | - Éric Akmansoy
- Institut d'Électronique Fondamentale, Univ. Paris-Sud, Université Paris-Saclay, Orsay, F-91405; UMR8622, CNRS, Orsay, F 91405, France.
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