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  • Optica Publishing Group  (3)
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  • Optica Publishing Group  (3)
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  • 1
    Online Resource
    Online Resource
    Focusing characteristics of cylindrical vector beams through a multi-focal all-dielectric grating lens
    Optica Publishing Group ; 2022
    In:  Optics Letters Vol. 47, No. 2 ( 2022-01-15), p. 253-
    Details
    In: Optics Letters, Optica Publishing Group, Vol. 47, No. 2 ( 2022-01-15), p. 253-
    Abstract: A novel, to the best of our knowledge, type of multi-focal all-dielectric grating lens is proposed in this work, and focusing characteristics of cylindrical vector beams through the lens are investigated in detail. Based on the negative refraction mechanism of negative-first-order diffraction and Fermat’s principle, a multi-focal lens is designed. By analyzing the diffraction effect of the grating, the essential factor that affects the focus quality is found. Through a two-step optimization process, secondary foci and the focal displacement of primary foci caused by high-order diffractions are overcome, and the quality of the focal field is significantly improved. This work provides a reference for micro-lens design for focus modulation, and the research results also have potential applications in the fields of light-field manipulation and optical tweezers.
    Type of Medium: Online Resource
    ISSN: 0146-9592 , 1539-4794
    URL: Article
    DOI: 10.1364/OL.448313
    Language: English
    Publisher: Optica Publishing Group
    Publication Date: 2022
    detail.hit.zdb_id: 243290-0
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    Online Resource
  • 2
    Online Resource
    Online Resource
    Highly sensitive soft optical fiber tactile sensor
    Optica Publishing Group ; 2022
    In:  Optics Express Vol. 30, No. 19 ( 2022-09-12), p. 34064-
    Details
    In: Optics Express, Optica Publishing Group, Vol. 30, No. 19 ( 2022-09-12), p. 34064-
    Abstract: A soft highly sensitive tactile sensor based on an in-fiber interferometer embedded in polydimethylsiloxane (PDMS) structure is studied. Theoretical simulation obtains that the high order sensing modes and PDMS can improve the sensitivity. Experiments show that different order sensing modes, derived by fast Fourier transform (FFT) and inverse FFT methods, present different sensing performance. Corresponding to high order mode, 1.3593 nm/kPa sensitivity and 37 Pa (0.015 N) detection limit is obtained. Meanwhile, it also shows very good stability, reproducibility, and response time. This study not only demonstrates a tactile sensor with high sensitivity but also provides a novel sensing modes analysis method.
    Type of Medium: Online Resource
    ISSN: 1094-4087
    URL: Article
    DOI: 10.1364/OE.467865
    Language: English
    Publisher: Optica Publishing Group
    Publication Date: 2022
    detail.hit.zdb_id: 1491859-6
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  • 3
    Online Resource
    Online Resource
    Single-shot terahertz polarization detection based on terahertz time-domain spectroscopy
    Optica Publishing Group ; 2022
    In:  Photonics Research Vol. 10, No. 6 ( 2022-06-01), p. 1374-
    Details
    In: Photonics Research, Optica Publishing Group, Vol. 10, No. 6 ( 2022-06-01), p. 1374-
    Abstract: This paper presents a novel design for single-shot terahertz polarization detection based on terahertz time-domain spectroscopy (THz-TDS). Its validity has been confirmed by comparing its detection results with those of the THz common-path spectral interferometer through two separate measurements for the orthogonal components. Our results also show that its detection signal-to-noise ratios (SNRs) are obviously superior to those of the 45° optical bias THz-TDS by electro-optical sampling due to its operation on common-path spectral interference rather than the polarization-sensitive intensity modulation. The setup works without need of any optical scan, which does not only save time, but also efficiently avoids the disturbances from the fluctuations of the system and environment. Its single-shot mode allows it to work well for the applications with poor or no repeatability.
    Type of Medium: Online Resource
    ISSN: 2327-9125
    URL: Article
    DOI: 10.1364/PRJ.449196
    Language: English
    Publisher: Optica Publishing Group
    Publication Date: 2022
    detail.hit.zdb_id: 2724783-1
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