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| 1 | Graphene-loaded metal wire grating for deep and broadband THz modulation in total internal reflection geometry显示文摘We employed a metallic wire grating loaded with graphene and operating in total internal reflection (TIR) geometry to realize deep and broadband THz modulation. The non-resonant field enhancement effect of the evanescent wave in TIR geometry and in the subwavelength wire grating was combined to demonstrate a ~77% modulation depth (MD) in the frequency range of 0.2–1.4 THz. This MD, achieved electrically with a SiO_2∕Si gated graphene device, was 4.5 times higher than that of the device without a metal grating in transmission geometry. By optimizing the parameters of the metallic wire grating, the required sheet conductivity of graphene for deep modulation was lowered to 0.87 mS. This work has potential applications in THz communication and real-time THz imaging. | YIWEN SUN RICCARDO DEGLJINNOCENTI DAVID A.RITCHIE HARVEY E.BEERE LONG XIAO MICHAEL RUGGIERO J.AXEL ZEITLER RAYKO I.STANTCHEV DANNI CHEN ZHENGCHUN PENG EMMA MACPHERSON XUDONG LIU | 2018 | Photonics Research2018，6，12： | 2 |
| 2 | Frequency-tunable continuous-wave random lasers at terahertz frequencies显示文摘Random lasers are a class of devices in which feedback arises from multiple elastic scattering in a highly disordered structure,providing an almost ideal light source for artefact-free imaging due to achievable low spatial coherence.However,for many applications ranging from sensing and spectroscopy to speckle-free imaging,it is essential to have high-radiance sources operating in continuous-wave(CW).In this paper,we demonstrate CW operation of a random laser using an electrically pumped quantum-cascade laser gain medium in which a bi-dimensional(2D)random distribution of air holes is patterned into the top metal waveguide.We obtain a highly collimated vertical emission at ~3 THz,with a 430 GHz bandwidth,device operation up to 110 K,peak(pulsed)power of 21 mW,and CW emission of 1.7 mW.Furthermore,we show that an external cavity formed with a movable mirror can be used to tune a random laser,obtaining continuous frequency tuning over 11 GHz. | Simone Biasco Harvey E.Beere David A.Ritchie Lianhe Li AGiles Davies Edmund H.Linfield Miriam S.Vitiello | 2019 | Light(Science & Applications)2019，8，1： | 2 |
| 3 | All dielectric metasurfaces for spin-dependent terahertz wavefront control显示文摘Metasurfaces consisting of artificial subwavelength structure arrays have shown unprecedented ability to manipulate the phase,amplitude,and polarization of light.Separate and complete control over different spin states,namely the orthogonal circular polarizations,has proven more challenging as compared to the control over orthogonal linear polarizations.Here,we present and experimentally demonstrate several spin-dependent wavefront control metasurfaces in the terahertz regime using all-silicon dielectric structures.Such spin-dependent allsilicon metasurfaces are easy to fabricate and have potential applications in spin-involved ultracompact and miniaturized terahertz optical systems as well as terahertz communication systems. | TONG WU HUIFANG ZHANG SIVALOGANATHAN KUMARAN YUEHONG XU QINGWEI WANG WLADISLAW MICHAILOW XUEQIAN ZHANG HARVEY E.BEERE DAVID A.RITCHIE JIAGUANG HAN | 2022 | Photonics Research2022，10，7： | 1 |
| 4 | Multiple outbreaks of dengue serotype 2 in north Queensland, 2003/04显示文摘 | Jeffrey N.Hanna Scott A.Ritchie Ann R.Richards Carmel T.Taylor Alyssa T.Pyke Brian L.Montgomery John P.Piispanen Anna K.Morgan Jan L.Humphreys | 2007 | Australian and New Zealand Journal of Public Health2007，，3： | 1 |
| 5 | Spatial coherence of electrically pumped random terahertz lasers显示文摘Light sources with high radiance and tailored coherence properties are highly desirable for imaging applications in the mid-infrared and terahertz(THz) spectral regions, which host a large variety of molecular absorptions and distinctive fingerprints to be exploited for sensing and tomography. Here, we characterize the spatial coherence of random multimode THz quantum cascade lasers(QCLs) emitting > m W optical power per mode and showing low divergence(10°–30°), performing a modified Young’s double-slit experiment. Partial spatial coherence values ranging between 0.16 and 0.34 are retrieved, depending on the specific degree of disorder. These values are significantly lower than those(0.82) of conventional Fabry–Perot THz QCLs exploiting an identical active region quantum design. We then incorporate the devised low spatial coherence random lasers into a confocal imaging system with micrometer spatial resolution and demonstrate notable imaging performances, at THz frequencies,against spatial cross talk and speckles. | Eva A.A.Pogna Alessandra Di Gaspare Kimberly Reichel Chiara Liberatore Harvey E.Beere David A.Ritchie Miriam S.Vitiello | 2022 | Photonics Research2022，10，2： | 0 |
| 6 | Spatiotemporal continuum generation in polariton waveguides显示文摘We demonstrate the generation of a spatiotemporal optical continuum in a highly nonlinear exciton–polariton waveguide using extremely low excitation powers(2-ps,100-W peak power pulses)and a submillimeter device suitable for integrated optics applications.We observe contributions from several mechanisms over a range of powers and demonstrate that the strong light–matter coupling significantly modifies the physics involved in all of them.The experimental data are well understood in combination with theoretical modeling.The results are applicable to a wide range of systems with linear coupling between nonlinear oscillators and particularly to emerging polariton devices that incorporate materials,such as gallium nitride and transition metal dichalcogenide monolayers that exhibit large light–matter coupling at room temperature.These open the door to low-power experimental studies of spatiotemporal nonlinear optics in submillimeter waveguide devices. | Paul M.Walker Charles E.Whittaker Dmitry V.Skryabin Emiliano Cancellieri Ben Royall Maksym Sich Ian Farrer David A.Ritchie Maurice S.Skolnick Dmitry N.Krizhanovskii | 2019 | Light(Science & Applications)2019，8，1： | 0 |
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