Youwen Liu

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An electrically controlled superresolution filter is proposed for the manipulation of transverse superresolution performance and axial focal shift. It consists of two parallel polarizers and a four-zone electro-optic crystal. The spatial manipulation of the polarization state and intensity can be realized by voltage applied on this four-zone electro-optic(More)
We present a spatial frequency domain multiplexing method for extending the imaging depth range of a spectral domain optical coherence tomography (SDOCT) system without any expensive device. This method uses two galvo scanners with different pivot-offset distances in two independent reference arms for spatial frequency modulation and multiplexing. The(More)
In this letter, mode-locked erbium doped fiber by using thulium and holmium co-doped fiber as the saturable absorber was observed under the situation of a long cavity. Stable mode-locked pulses with duration of 465 ns at a repetition rate of 216.7 kHz were obtained. Besides, it was found that the laser could be running from Q-switched state into mode-locked(More)
A compact plasmonic nanofilter based on the metal-insulator-metal (MIM) waveguide with an Archimedes' spiral structure is proposed and demonstrated by the finite-difference time-domain (FDTD) method. The simulation results indicate that the transmission valley and peak can be tuned by the rotation angle θ of the right-handed Archimedes spiral(More)
According to the Maxwellpsilas equations we present a theoretical investigation of polarizing beam propagating in the anisotropic metamaterial slab . At the interface associated with a certain anisotropic metamaterial, TE and TM-polarized waves exhibit opposite amphoteric refraction characteristics, such that one polarized wave is positively refracted(More)
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