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Highly efficient surface-emitting semiconductor lasers exploiting quasi-crystalline distributed feedback photonic patterns

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Light(Science & Applications) 2020年第1期9卷 1498-1508页

作者： Simone Biasco andrea ciavatti Lianhe Li AGiles Davies Edmund H.Linfield Harvey Beere David Ritchie Miriam S.Vitiello NEST CNR-Istituto Nanoscienze and Scuola Normale SuperiorePiazza San Silvestro 1256127 PisaItaly School of Electronic and Electrical Engineering University of LeedsLeeds LS29JTUK Cavendish Laboratory University of CambridgeCambridge CB30HEUK

Quasi-crystal distributed feedback lasers do not require any form of mirror cavity to amplify and extract *** implemented on the top surface of a semiconductor laser,a quasi-crystal pattern can be used to tune both the radiation feedback and the extraction of highly radiative and high-quality-factor optical modes that do not have a defined symmetric or anti-symmetric ***,this methodology offers the possibility to achieve efficient emission,combined with tailored spectra and controlled beam ***,we apply this concept to a onedimensional quantum cascade wire *** lithographically patterning a series of air slits with different widths,following the Octonacci sequence,on the top metal layer of a double-metal quantum cascade laser operating at THz frequencies,we can vary the emission from single-frequency-mode to multimode over a 530-GHz bandwidth,achieving a maximum peak optical power of 240mW(190 mW)in multimode(single-frequency-mode)lasers,with record slope efficiencies for multimode surface-emitting disordered THz lasers up to ≈570 mW/A at 78 K and ≈720 mW/A at 20 K and wall-plug efficiencies of η≈1%.

关键词： lasers surface quantum

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Flexible fully organic indirect detector for megaelectronvolts proton beams

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npj Flexible Electronics 2023年第1期7卷 513-523页

作者： Sabrina Calvi Laura Basiricò Sara M.Carturan Ilaria Fratelli Antonio Valletta Alberto Aloisio Stefania De Rosa Felix Pino Marcello Campajola andrea ciavatti Luca Tortora Matteo Rapisarda Sandra Moretto Matteo Verdi Stefano Bertoldo Olivia Cesarini Paolo Di Meo Massimo Chiari Francesco Tommasino Ettore Sarnelli Luigi Mariucci Paolo Branchini Alberto Quaranta Beatrice Fraboni INFN Sezione di RomaTreVia Della Vasca Navale 8400146 RomaItaly CNR-Institute for Microelectronics and Microsystems(IMM)Via Del Fosso Del Cavaliere 10000133 RomeItaly Department of Physics and Astronomy University of BolognaViale C.Berti Pichat 6/240127 BolognaItaly INFN Sezione di BolognaViale C.Berti Pichat 6/240127 BolognaItaly Department of Physics and Astronomy University of PadovaVia Marzolo 8PadovaItaly INFN-Laboratori Nazionali di Legnaro Viale dell’Università2LegnaroItaly University of Naples Federico II Department of PhysicsComplesso Univ.di Monte S.AngeloEdificio GVia Cintia80126 NapoliItaly INFN-Sezione di Napoli-Complesso Univ.di Monte S.Angelo Edificio GVia Cintia80126 NapoliItaly CNR-SPIN Via Campi Flegrei3480078 PozzuoliNAItaly Task Force di Bioelettronica University of Naples Federico IINapoliItaly Department of Sciences Roma Tre UniversityVia della Vasca Navale 8400146 RomaItaly INFN Sezione di PadovaVia Marzolo 8PadovaItaly INFN Sezione di FirenzeVia G.Sansone 150019 Sesto FiorentinoFlorenceItaly Department of Physics University of TrentoVia Sommarive 1438123 TrentoPovoItaly INFN-TIFPA Via Sommarive 1438123 TrentoPovoItaly Department of Industrial Engineering University of TrentoVia Sommarive 938123 TrentoPovoItaly

A flexible,fully organic detector for proton beams is presented *** detector operates in the indirect mode and is composed of a polysiloxane-based scintillating layer coupled to an organic phototransistor,that is assessed for flexibility and low-voltage operation(V=−1 V),with a limit of detection of 0.026 Gy min^(−1).We present a kinetic model able to precisely reproduce the dynamic response of the device under irradiation and to provide further insight into the physical processes controlling *** detector is designed to target real-time and in-situ dose monitoring during proton therapy and demonstrates mechanical flexibility and low power operation,assessing its potential employment as a personal dosimeter with high comfort and low risk for the *** results show how such a proton detector represents a promising tool for real-time particle detection over a large area and irregular surfaces,suitable for many applications,from experimental scientific research to innovative theranostics.

关键词： fully limit insight

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