Search Results - "ROSKOS, Hartmut G"

Roadmap of Terahertz Imaging 2021 by Valušis, Gintaras, Lisauskas, Alvydas, Yuan, Hui, Knap, Wojciech, Roskos, Hartmut G

“…In this roadmap article, we have focused on the most recent advances in terahertz (THz) imaging with particular attention paid to the optimization and…”
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Terahertz white-light pulses from an air plasma photo-induced by incommensurate two-color optical fields by Thomson, Mark D, Blank, Volker, Roskos, Hartmut G

“…We demonstrate plasma-THz generation in ambient air with two-color (ω-2ω) optical excitation using input pulses with a bandwidth supporting sub-20-fs duration,…”
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Passive Detection and Imaging of Human Body Radiation Using an Uncooled Field-Effect Transistor-Based THz Detector by Čibiraitė-Lukenskienė, Dovilė, Ikamas, Kęstutis, Lisauskas, Tautvydas, Krozer, Viktor, Roskos, Hartmut G, Lisauskas, Alvydas

“…This work presents, to our knowledge, the first completely passive imaging with human-body-emitted radiation in the lower THz frequency range using a broadband…”
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State-of-the-Art Room Temperature Operable Zero-Bias Schottky Diode-Based Terahertz Detector Up to 5.56 THz by Yadav, Rahul, Ludwig, Florian, Faridi, Fahd Rushd, Klopf, J Michael, Roskos, Hartmut G, Preu, Sascha, Penirschke, Andreas

“…We present the characterization of a Zero-bias Schottky diode-based Terahertz (THz) detector up to 5.56 THz. The detector was operated with both a table-top…”
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Nonlocal collective ultrastrong interaction of plasmonic metamaterials and photons in a terahertz photonic crystal cavity by Meng, Fanqi, Thomson, Mark D, Klug, Bernhard, Čibiraitė, Dovilė, Ul-Islam, Qamar, Roskos, Hartmut G

“…Light-matter interaction in the strong coupling regime is of profound interest for fundamental quantum optics, information processing and the realization of…”
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CMOS detector arrays in a virtual 10-kilopixel camera for coherent terahertz real-time imaging by Boppel, Sebastian, Lisauskas, Alvydas, Max, Alexander, Krozer, Viktor, Roskos, Hartmut G

“…We demonstrate the principle applicability of antenna-coupled complementary metal oxide semiconductor (CMOS) field-effect transistor arrays as cameras for…”
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Strong coupling of metamaterials with cavity photons: toward non-Hermitian optics by Meng, Fanqi, Cao, Lei, Mangeney, Juliette, Roskos, Hartmut G.

“…The investigation of strong coupling between light and matter is an important field of research. Its significance arises not only from the emergence of a…”
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Direct nanoscopic observation of plasma waves in the channel of a graphene field-effect transistor by Soltani, Amin, Kuschewski, Frederik, Bonmann, Marlene, Generalov, Andrey, Vorobiev, Andrei, Ludwig, Florian, Wiecha, Matthias M., Čibiraitė, Dovilė, Walla, Frederik, Winnerl, Stephan, Kehr, Susanne C., Eng, Lukas M., Stake, Jan, Roskos, Hartmut G.

“…Plasma waves play an important role in many solid-state phenomena and devices. They also become significant in electronic device structures as the operation…”
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Saturable absorption of femtosecond optical pulses in multilayer turbostratic graphene by Meng, Fanqi, Thomson, Mark D, Bianco, Federica, Rossi, Antonio, Convertino, Domenica, Tredicucci, Alessandro, Coletti, Camilla, Roskos, Hartmut G

“…We investigate the nonlinear transmission of a ~280-layer turbostratic graphene sheet for near-infrared amplifier laser pulses (775 nm, Ti:sapphire laser) with…”
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Dual-band polarization-independent sub-terahertz fishnet metamaterial by Sabah, Cumali, Roskos, Hartmut G.

“…A dual-band and polarization-independent fishnet metamaterial for the sub-THz frequency range is proposed and investigated. Dual-band modes have two resonances…”
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Spin-conserving carrier recombination in conjugated polymers by Lupton, John M, Reufer, Martin, Walter, Manfred J, Lagoudakis, Pavlos G, Hummel, Anne Beate, Kolb, Johanna S, Roskos, Hartmut G, Scherf, Ullrich

“…The ultimate efficiency of polymer light-emitting diodes is limited by the fraction of charges recombining in the molecular singlet manifold. We address the…”
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Anisotropic excitation of surface plasmon polaritons on a metal film by a scattering-type scanning near-field microscope with a non-rotationally-symmetric probe tip by Walla, Frederik, Wiecha, Matthias M., Mecklenbeck, Nicolas, Beldi, Sabri, Keilmann, Fritz, Thomson, Mark D., Roskos, Hartmut G.

“…We investigated the excitation of surface plasmon polaritons on gold films with the metallized probe tip of a scattering-type scanning near-field optical…”
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Direct Near-Field Observation of Surface Plasmon Polaritons on Silver Nanowires by Wiecha, Matthias M, Al-Daffaie, Shihab, Bogdanov, Andrey, Thomson, Mark D, Yilmazoglu, Oktay, Küppers, Franko, Soltani, Amin, Roskos, Hartmut G

“…Surface plasmon polaritons on (silver) nanowires are promising components for future photonic technologies. Here, we study near-field patterns on silver…”
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Broadband Terahertz Power Detectors Based on 90-nm Silicon CMOS Transistors With Flat Responsivity Up to 2.2 THz by Ikamas, Kestutis, Cibiraite, Dovile, Lisauskas, Alvydas, Bauer, Maris, Krozer, Viktor, Roskos, Hartmut G.

“…We present broadband high sensitivity terahertz (THz) detectors based on 90 nm CMOS technology with the state-of-the-art performance. The devices are based on…”
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600-GHz Fourier imaging based on heterodyne detection at the 2nd sub-harmonic by Yuan, Hui, Lisauskas, Alvydas, Thomson, Mark D., Roskos, Hartmut G.

“…Fourier imaging is an indirect imaging method which records the diffraction pattern of the object scene coherently in the focal plane of the imaging system and…”
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Determining the absolute temporal field of ultra-broadband terahertz-infrared pulses with field-induced second-harmonic spectrograms by Thomson, Mark D, Warawa, Konstantin, Meng, Fanqi, Roskos, Hartmut G

“…We demonstrate the use of spectrograms of the field-induced second-harmonic (FISH) signal generated in ambient air, to reconstruct the absolute temporal…”
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Strong coupling of plasmonic bright and dark modes with two eigenmodes of a photonic crystal cavity by Meng, Fanqi, Cao, Lei, Karalis, Aristeidis, Gu, Hantian, Thomson, Mark D., Roskos, Hartmut G.

“…Dark modes represent a class of forbidden transitions or transitions with weak dipole moments between energy states. Due to their low transition probability,…”
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Can a terahertz metamaterial sensor be improved by ultra-strong coupling with a high-Q photonic resonator? by Cao, Lei, Jia, Shanshan, Thomson, Mark D, Meng, Fanqi, Roskos, Hartmut G

“…When a metamaterial (MM) is embedded in a one-dimensional photonic crystal (PC) cavity, the ultra-strong coupling between the MM plasmons and the photons in…”
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Antenna-Integrated 0.6 THz FET Direct Detectors Based on CVD Graphene by Zak, Audrey, Andersson, Michael A, Bauer, Maris, Matukas, Jonas, Lisauskas, Alvydas, Roskos, Hartmut G, Stake, Jan

“…We present terahertz (THz) detectors based on top-gated graphene field effect transistors (GFETs) with integrated split bow-tie antennas. The GFETs were…”
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Strong interaction between two photons and a plasmon of a complementary metamaterial in a terahertz dual cavity by Meng, Fanqi, Thomson, Mark D., Klug, Bernhard, Roskos, Hartmut G.

“…Guided by Babinet’s principle, we explore strong coupling between the effective magnetic dipole moments of complementary split-slotring metamaterials and the…”
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