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| 1 | Ultrafast response of harmonic modelocked THz lasers显示文摘The use of fundamental modelocking to generate short terahertz(THz)pulses and THz frequency combs from semiconductor lasers has become a routine affair,using quantum cascade lasers(QCLs)as a gain medium.However,unlike classic laser diodes,no demonstrations of harmonic modelocking,active or passive,have been shown in THz QCLs,where multiple pulses per round trip are generated when the laser is modulated at the harmonics of the cavity’s fundamental round-trip frequency.Here,using time-resolved THz techniques,we show for the first time harmonic injection and mode-locking in which THz QCLs are modulated at the harmonics of the round-trip frequency.We demonstrate the generation of the harmonic electrical beatnote within a QCL,its injection locking to an active modulation and its direct translation to harmonic pulse generation using the unique ultrafast nature of our approach.Finally,we show indications of self-starting harmonic emission,i.e.,without external modulation,where the QCL operates exclusively on a harmonic(up to its 15th harmonic)of the round-trip frequency.This behaviour is supported by time-resolved simulations of induced gain and loss in the system and shows the importance of the electronic,as well as photonic,nature of QCLs.These results open up the prospect of passive harmonic modelocking and THz pulse generation,as well as the generation of low-noise microwave generation in the hundreds of GHz region. | Feihu Wang Valentino Pistore Michael Riesch Hanond Nong Pierre-Baptiste Vigneron Raffaele Colombelli Olivier Parillaud Juliette Mangeney Jerome Tignon Christian Jirauschek Sukhdeep S.Dhillon | 2020 | Light(Science & Applications)2020，9，1： | 3 |
| 2 | Performance prediction with skeletons显示文摘 | Sukhdeep Sodhi Jaspal Subhlok Qiang Xu | 2008 | Cluster Computing2008，，2： | 1 |
| 3 | Photoactive chemosensors 4:a Cu2+ protein cavity mimicking fluorescent chemosensor for selective Cu2+ recognition显示文摘 | Sukhdeep K Subodh K | 2004 | Tetrahedron Lett2004，45，26： | 1 |
| 4 | Ten- sile and flexural behavior of hemp fiber reinforced virginrecy- cled HDPE matrix composites 显示文摘 | SUKHDEEP S DHARMPAL D LAKSHYA A | 2014 | Procedia Mater Sci2014，，6： | 1 |
| 5 | Prevalence of Barrett’s Esophagus in Hispanics Is Similar to Caucasians显示文摘 | Korina Bersentes Ronnie Fass Sukhdeep Padda Cynthia Johnson Richard E. Sampliner | 1998 | Digestive Diseases and Sciences1998，，5： | 1 |
| 6 | The Percutaneous Ventricular Assist Device in Severe Refractory Cardiogenic Shock显示文摘 | Biswajit Kar Igor D. Gregoric Sukhdeep S. Basra Gary M. Idelchik Pranav Loyalka | 2011 | Journal of the American College of Cardiology2011，，6： | 1 |
| 7 | Cardiovascular Care for Older Adults Aortic valve disease in the older adult显示文摘 | Neal Bhatia Sukhdeep S Basra Adam H Skolnick Nanette K Wenger | 2016 | Journal of Geriatric Cardiology2016，13，12： | 1 |
| 8 | High Q and sub-wavelength THz electric field confinement in ultrastrongly coupled THz resonators显示文摘The control of light–matter coupling at the single electron level is currently a subject of growing interest for the development of novel quantum devices and for studies and applications of quantum electrodynamics.In the terahertz(THz)spectral range,this raises the particular and difficult challenge of building electromagnetic resonators that can conciliate low mode volume and high quality factor.Here,we report on hybrid THz cavities based on ultrastrong coupling between a Tamm cavity and an LC circuit metamaterial and show that they can combine high quality factors of up to Q=37 with a deep-subwavelength mode volume of V=3.2×10^(-4)λ^(3).Our theoretical and experimental analysis of the coupled mode properties reveals that,in general,the ultrastrong coupling between a metamaterial and a Fabry–Perot cavity is an effective tool to almost completely suppress radiative losses and,thus,ultimately limit the total losses to the losses in the metallic layer.These Tamm cavity-LC metamaterial coupled resonators open a route toward the development of single photon THz emitters and detectors and to the exploration of ultrastrong THz light–matter coupling with a high degree of coherence in the few to single electron limit. | SIMON MESSELOT SOLEN COEYMANS JEROME TIGNON SUKHDEEP DHILLON JULIETTE MANGENEY | 2023 | Photonics Research2023，11，7： | 0 |
| 9 | Layer-controlled nonlinear terahertz valleytronics in two-dimensional semimetal and semiconductor PtSe_(2)显示文摘Platinum diselenide(PtSe_(2))is a promising two-dimensional(2D)material for the terahertz(THz)range as,unlike other transition metal dichalcogenides(TMDs),its bandgap can be uniquely tuned from a semiconductor in the nearinfrared to a semimetal with the number of atomic layers.This gives the material unique THz photonic properties that can be layer-engineered.Here,we demonstrate that a controlled THz nonlinearity—tuned from monolayer to bulk PtSe_(2)—can be realized in wafer size polycrystalline PtSe_(2)through the generation of ultrafast photocurrents and the engineering of the bandstructure valleys.This is combined with the PtSe_(2)layer interaction with the substrate for a broken material centrosymmetry,permitting a second order nonlinearity.Further,we show layer dependent circular dichroism,where the sign of the ultrafast currents and hence the phase of the emitted THz pulse can be controlled through the excitation of different bandstructure valleys.In particular,we show that a semimetal has a strong dichroism that is absent in the monolayer and few layer semiconducting limit.The microscopic origins of this TMD bandstructure engineering are highlighted through detailed DFT simulations,and shows the circular dichroism can be controlled when PtSe_(2)becomes a semimetal and when the K-valleys can be excited.As well as showing that PtSe_(2)is a promising material for THz generation through layer controlled optical nonlinearities,this work opens up a new class of circular dichroism materials beyond the monolayer limit that has been the case of traditional TMDs,and impacting a range of domains from THz valleytronics,THz spintronics to harmonic generation. | Minoosh Hemmat Sabrine Ayari Martin Micica Hadrien Vergnet Shasha Guo Mehdi Arfaoui Xuechao Yu Daniel Vala Adrien Wright Kamil Postava Juliette Mangeney Francesca Carosella Sihem Jaziri Qi Jie Wang Zheng Liu Jérôme Tignon Robson Ferreira Emmanuel Baudin Sukhdeep Dhillon | 2023 | InfoMat2023，5，11： | 0 |
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