[email protected] - teraflag · 2018-10-02 · j.-f. lampin terahertz photonics...
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J.-F. Lampin 2
IntroductionInstitut d’Electronique de Microélectronique et de Nanotechnologies (IEMN)
The Terahertz Photonics Group:
• THz photomixers
• THz detectors
• THz communications
• THz non-reciprocal devices
• THz/MIR s-SNOM
• GHz/THz sampling
• Molecular THz lasers
• THz biophotonics
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J.-F. Lampin
THz CW: Photomixing
Lentille Si
Antenne
Substrat semiconducteur
Laser 1, ν1
Laser 2, ν2
THz
Photodétecteur
fTHz = ν2 - ν1
• Largement accordable• Simple (2 étages)
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J.-F. Lampin
THz photomixersPhotomélangeur = photodétecteur + antenne
Photoconducteur GaAs-BT + antenne spirale
Photoconducteur GaAs-BT + antenne cornet
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Ce couple doit être le plus performant possible !Verrous : densité de courant et adaptation d’impédance
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J.-F. Lampin
Antennas
• Large bande et peu dispersive(utilisable en impulsionnel ou en CW)• Pas de THz dans le substrat• Intégrables avec tous composants THz• Monolithique, pas de gravure profonde
Problème des antennes THz monolithiques: rayonnement dans le substrat
0,8 mm
Cornet TEM0,1-1 THz
J.-F. Lampin, E. PeytavitBrevet FR2908931 (2006)
DiagrammesPlan E (CW)
En régime impulsionnel
Peytavit et al., EL 43, 73, (2007)Peytavit et al., APL 93, 111108 (2008)Prissette et al., IEEE MWCL 21, 49 (2011)Beck et al., C.R. Physique 11, 472 (2010)
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J.-F. Lampin
• Cavité Fabry-Pérot miroirs métalliques• Photoconducteur LTG-GaAs sur Si
Puissance record dans la bande 220-325 GHz (photomélange) :1.8 mW @ 0.25 THz, amélioration 100× pour LTG-GaAs !
Peytavit et al., Appl. Phys. Express 4, 104101 (2011)Peytavit et al., Appl. Phys. Lett. 99, 223508 (2011)Peytavit et al., IEEE Electron. Device Lett. 34, 1277 (2013)
Etat de l’art:0.6 mW @300 GHz (UTC-PD, NTT)
Resonant vertical photomixer
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E. Peytavit, J.-F. LampinBrevet FR2949905 (2009)
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J.-F. Lampin
1.55 µm THz UTC-photodiodes
e-
h+
Contact
InPSub-Coll.(n)
InPColl.(i)
Zone absorbantegraduelle
100 nm137 nm
InGaAs(p)
fréquence de coupure :• Zone absorbante graduelle• Petite section• Collecteur court
3 µm2 éclairage substrat
Structure UTC-PD:
1 µW @ 1 THz Record de rendementBeck et al., Electron. Lett. 44, 1320 (2008)
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UTC-PD à grille métallique400 µW @ 300 GHz
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J.-F. Lampin
Sub-THz communications
Highlight in ElectronicsLetters (2010)
Ducournau et al., Electron. Lett. 46, 1349 (2010)
• Emetteur 1 Gb/s@200 GHz télé-alimenté• Test dans un système complet
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46 Gbps @ 0.4 THz
Ducournau et al., EL 50, 413 (2014)
HDTV @ 0.6 THz !
Ducournau et al., IEEE TTST (2014)
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J.-F. Lampin 9
Sub-sampling @ 300 GHzwith 1.5 µm comb ML laser
1.5 µm
M. Billet et al., EL 53, p.1596 2017
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J.-F. Lampin
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1st molecular pumped by a QCL1 mW @ 1THz, high efficiency, room temprature
MIR-pumped molecular THz laser
A. Pagies, G. Ducournau, J.-F. Lampin, APL Photonics 1, 031302 (2016)
New THz laser
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J.-F. Lampin
THz near-field microscopy
EQUIPEX EXCELSIOR
Sieger et al., Nanoletters (2010)
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Nanopart. Au 15 nm sous 6 nm de SiO2(λ = 10 µm)
Topographie S-SNOM
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J.-F. Lampin 12
s-SNOM: islands of graphene
Topography
Collab: D. Vignaud
O2 Signal (966 cm-1)
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J.-F. Lampin
Heinrich Rubens at work in the laboratory(Physical Institute, Univ. Berlin)
Rubens expriment
1911
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J.-F. Lampin
Heinrich Rubens at work in the laboratory(Physical Institute, Univ. Berlin)
Rubens experiment
1911