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Wu P.,Key Laboratory of Optical Information Science and Technology | Wu P.,Nankai University | Tang S.,Crystal Research, Inc.
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2015

Currently available wavelength-tunable lasers have technical difficulty in combining high-speed, continuous and wide wavelength tunability with high output power. We demonstrated a high-speed wavelength-tunable laser based on a fast electro-optic effect. We observed that the wavelength-swept speed exceeds 107 nm/s at center wavelength of 1550 nm with continuous wavelength tunability. Moreover, the maximum output power is over 100 mW and the wavelength tuning range is near 100 nm with a full width at half maximum of less than 0.5 nm. © 2015 SPIE CCC. Source


Liang Z.,Nankai University | Wu P.,Key Laboratory of Optical Information Science and Technology | Wu P.,Nankai University
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2015

An all-optical switching device is demonstrated with a nonlinear waveguide structure filled with liquid crystal. The signal field coupled out the glass cladding has interesting intensity-depended property due to the coupling of two different nonlinear dynamics in the nonlinear optical layer. The device has an additional feature that the switching sign is controllable from positive to negative. © 2015 SPIE. Source


Chen M.,Nankai University | Fan F.,Nankai University | Wu P.,Key Laboratory of Optical Information Science and Technology | Zhang H.,China University of Petroleum - East China | Chang S.,Key Laboratory of Optical Information Science and Technology
Optics Communications | Year: 2015

We have proposed an electrically controllable terahertz (THz) beam scanning device based on asymmetric graphene plasmonic grating. It is proved that the dispersion relation of surface plasmon waves can be efficiently manipulated on the periodic metal-dielectric-graphene plasmonic structure by an external bias voltage, and thus the derivation angle of the THz beam can be actively tuned. The numerical results show that the radiation angle of THz waves through this device can be tuned from -18° to 18° with the bias changing from 53.5 mV into 368.8 mV at the operating frequency of 0.5 THz. This electrically active beam scanning device has important application in the THz imaging, radar and communication systems. © 2015 Elsevier B.V. All rights reserved. Source


Chen S.,Nankai University | Fan F.,Nankai University | Wang X.,Nankai University | Wu P.,Key Laboratory of Optical Information Science and Technology | And 2 more authors.
Optics Express | Year: 2015

A magneto-metasurface with nonreciprocal terahertz (THz) transmission has been proposed to form a THz isolator. Importantly, we have discussed the two necessary conditions for THz nonreciprocal transmission in the metasurface: (1) There should be magneto-optical responses for THz waves in the metasurface; (2) The transmission system of the metasurface needs to be asymmetric for forward and backward waves. These two conditions lead to the time reversal symmetry breaking of system, and the magnetoplasmon mode splitting and nonreciprocal resonance enhancement can be observed in the asymmetry magnetometasurface. Moreover, the isolation dependences and tunability on the external magnetic field and temperature have also been investigated, which shows that the best operating state with a high isolation can be designed. The numerical simulations show a maximum isolation of 43 dB and a 10 dB operating bandwidth of 20 GHz under an external magnetic field of 0.3 T, and the insertion loss is smaller than 1.79 dB. This low-loss, high isolation, easy coupling THz isolator has broadly potentials for THz application systems. © 2015 Optical Society of America. Source


Chen S.,Nankai University | Fan F.,Nankai University | Wu P.,Nankai University | Liu B.,Key Laboratory of Optical Information Science and Technology | Chang S.,Key Laboratory of Optical Information Science and Technology
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2015

In this paper, we have reviewed our research on terahertz (THz) isolators and nonreciprocal transmission devices. In addition, we present a new kind of THz isolator based on asymmetry magneto-metasurface. A structured InSb layer coats on the silica substrate in which the numerical simulation shows that this metasurface has isolation over 60dB at 0.646 THz and a 10dB operating bandwidth of 13 GHz under an external magnetic field of 0.3T with an insertion loss less than 2.5dB. This kind of low-loss, high isolation, easy coupling THz magneto-metasurface isolator has broadly potentials for THz application systems. Importantly, we discuss and conclude the necessary conditions of forming THz nonreciprocal transmission in the magneto-material devices, which is strongly related with magneto-material and asymmetric transmission system. © 2015 SPIE. Source

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