Yen Ting Hsu

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We proposed a switchable beam steering device with cycloidal diffractive waveplate (CDW) for eye tracking in a virtual reality (VR) or augmented reality (AR) display system. Such a CDW diffracts the incident circularly polarized light to the first order with over 95% efficiency. To convert the input linearly polarized light to right-handed or left-handed(More)
We report a transient absorption study of photocarrier dynamics in transition metal dichalcogenide alloy, Mo 0.5 W 0.5 S 2. Photocarriers were injected by a 400-nm pump pulse and detected by a 660-nm probe pulse. We observed a fast energy relaxation process of about 0.7 ps. The photocarrier lifetime is in the range of 50-100 ps, which weakly depends on the(More)
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