GLORIA

GEOMAR Library Ocean Research Information Access

X

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
Filter
  • Han, Meiyao  (2)
Material
Publisher
Person/Organisation
Language
Years
  • 1
    Online Resource
    Online Resource
    Terahertz ptychography using a long-distance diffraction-free beam as the probe
    Optica Publishing Group ; 2022
    In:  Optics Letters Vol. 47, No. 2 ( 2022-01-15), p. 238-
    Details
    In: Optics Letters, Optica Publishing Group, Vol. 47, No. 2 ( 2022-01-15), p. 238-
    Abstract: We have implemented a terahertz (THz) ptychographic technique using a long-distance diffraction-free beam (DFB) instead of traditional low-energy pinhole-defined illumination as the probe. The DFB generating system containing two lens-axicon doublets is very easily realized. Measured transverse intensities of such a DFB display an Airy-pattern-like distribution. Based on the well-developed extended ptychographic iterative engine, we simultaneously reconstruct a phase object and the DFB probe with both simulated and real data. Further calculation shows that the DFB has abundant spatial high-frequency components that guarantee high coherence of the illuminating probe beam in our THz ptychographic system. In addition, we firmly believe that the proposed approach can be easily transplanted to the ptychography at other frequency bands as both lens and axicon are very common optical elements.
    Type of Medium: Online Resource
    ISSN: 0146-9592 , 1539-4794
    URL: Article
    DOI: 10.1364/OL.442964
    Language: English
    Publisher: Optica Publishing Group
    Publication Date: 2022
    detail.hit.zdb_id: 243290-0
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
  • 2
    Online Resource
    Online Resource
    Optical element to generate zero-order quasi-Bessel beam with “focal length”
    Optica Publishing Group ; 2022
    In:  Optics Letters Vol. 47, No. 3 ( 2022-02-01), p. 553-
    Details
    In: Optics Letters, Optica Publishing Group, Vol. 47, No. 3 ( 2022-02-01), p. 553-
    Abstract: An optical element has been invented to generate a zero-order quasi-Bessel beam with a certain distance to the element, which does not exist in the zero-order quasi-Bessel beam by using a traditional axicon. The cross section of designed element is an isosceles triangle whose equal sides are circumscribed by two semi-ellipses. Using a well-developed three-dimensional (3D)-printing technique, we have fabricated a series of elements working at terahertz (THz) frequency. Both simulated and experimental results clearly show that there is a certain distance between the generated quasi-Bessel beam and this element. A physical analysis based on geometric optics theory is performed to explain the obtained results. Because it is a refractive transmitted optical element, we propose that it can be also realized at another frequency band if the relevant processing techniques are available.
    Type of Medium: Online Resource
    ISSN: 0146-9592 , 1539-4794
    URL: Article
    DOI: 10.1364/OL.448852
    Language: English
    Publisher: Optica Publishing Group
    Publication Date: 2022
    detail.hit.zdb_id: 243290-0
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...