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Browsing by Author "Chiu, Chui-Min"

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    Terahertz scanning imaging with a subwavelength plastic fiber
    (2008-02-25)
    Lu, Ja-Yu
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    Chiu, Chui-Min
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    Kuo, Chung-Chiu
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    Lai, Chih-Hsien
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    Chang, Hung-Chung
    The feasibility to perform terahertz imaging utilizing a terahertz subwavelength plastic fiber is investigated. Dour study shows that, With a low (<1%) fractional power inside the fiber score, the bending loss of the terahertz subwavelength fiber is acceptable to enable large area scanning without seriously sacrificing the signal-to-noise ratio of the acquired image. With a transmission geometry, this feasibility is demonstrated by direct two-dimensional scanning of the terahertz subwavelength fiber output end to image different biological samples and concealed substances. (C) 2008 American Institute of Physics.
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    THz interferometric imaging using subwavelength plastic fiber based THz endoscopes
    (2008-02-18)
    Lu, Ja-Yu
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    Kuo, Chung-Chiu
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    Chiu, Chui-Min
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    Chen, Hung-Wen
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    Hwang, Yuh-Jing
    We demonstrate a new reflective imaging technique using continuous-wave THz fiber-endoscopy, in which the sample is placed behind the output of a THz subwavelength plastic fiber and the Fabry Perot interference is formed therein. 3D THz reflective images with a reasonable SNR as well as high lateral and subwavelength axial resolutions are acquired by moving the sample along the axial (z) direction and by 2D scanning the output end of the subwavelength plastic fiber without any focusing medium. By analyzing the axial-position dependent THz signals backward collected by the subwavelength plastic fiber, the THz reflection amplitudes and phases on the sample surface can be successfully reconstructed. (C) 2008 Optical Society of America.
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    THz interferometric imaging using subwavelength plastic fiber based THz endoscopes
    (2008-01-01)
    Lu, Ja-Yu
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    Kuo, Chung-Chiu
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    Chiu, Chui-Min
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    Chen, Hung-Wen
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    Pan, Ci-Ling
    We demonstrate a continuous-wave THz fiber-endoscopy by utilizing low-loss THz subwavelength plastic fibers. The reconstructed 3D images not only reflect the depth variation of the object surface, but also reveal the molecular distribution of samples. (C) 2008 Optical Society of America