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  • MDPI AG  (3)
  • Hsiao, Fu-Li  (3)
  • 1
    Online Resource
    Online Resource
    Photo-Elastic Enhanced Optomechanic One Dimensional Phoxonic Fishbone Nanobeam
    MDPI AG ; 2022
    In:  Crystals Vol. 12, No. 7 ( 2022-06-23), p. 890-
    Details
    In: Crystals, MDPI AG, Vol. 12, No. 7 ( 2022-06-23), p. 890-
    Abstract: We investigated the strength of acousto-optical (AO) interaction in one-dimensional fishbone silicon nanobeam computationally. The structure can generate phononic and photonic band gaps simultaneously. We use defect cavity optical mode and slow light mode to interact with acoustic defect modes. The AO coupling rates are obtained by adding the optical frequency shifts, which result from photo-elastic effect and moving-boundary effect disturbances. The AO coupling rates are strongly dependent on the overlap of acoustic and optical mode distribution. The strength of AO interaction can be enhanced by choosing certain acoustic defect modes that are formed by the stretching of wings and that overlap significantly with optical fields.
    Type of Medium: Online Resource
    ISSN: 2073-4352
    URL: Article
    DOI: 10.3390/cryst12070890
    Language: English
    Publisher: MDPI AG
    Publication Date: 2022
    detail.hit.zdb_id: 2661516-2
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  • 2
    Online Resource
    Online Resource
    Design of Waveguide Polarization Convertor Based on Asymmetric 1D Photonic Crystals
    MDPI AG ; 2022
    In:  Nanomaterials Vol. 12, No. 14 ( 2022-07-18), p. 2454-
    Details
    In: Nanomaterials, MDPI AG, Vol. 12, No. 14 ( 2022-07-18), p. 2454-
    Abstract: Photonic crystals possess metastructures with a unique dispersion relation. An integrated optical circuit plays a crucial role in quantum computing, for which miniaturized optical components can be designed according to the characteristics of photonic crystals. Because the stable light transmission mode for a square waveguide is transverse electric or transverse magnetic polarization, we designed a half-waveplate element with a photonic crystal that can rotate the polarization direction of the light incident on a waveguide by 90°. Using the dispersion relation of photonic crystals, the polarization rotation length and the optical axis’s angle of deviation from the electric field in the eigenmode can be effectively calculated. Polarization rotators designed on the basis of photonic crystal structures can effectively reduce the insertion loss of components and exhibit favorable polarization rotation performance.
    Type of Medium: Online Resource
    ISSN: 2079-4991
    URL: Article
    DOI: 10.3390/nano12142454
    Language: English
    Publisher: MDPI AG
    Publication Date: 2022
    detail.hit.zdb_id: 2662255-5
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  • 3
    Online Resource
    Online Resource
    High-Q Slow Sound Mode in a Phononic Fishbone Nanobeam Using an Acoustic Potential Well Cavity
    MDPI AG ; 2023
    In:  Crystals Vol. 13, No. 1 ( 2023-01-04), p. 95-
    Details
    In: Crystals, MDPI AG, Vol. 13, No. 1 ( 2023-01-04), p. 95-
    Abstract: Phononic crystals and phononic metamaterials are popular structures for manipulating acoustic waves with artificially arranged units that have different elastic constants. These structures are also used in acousto-optic coupling and optomechanical structures. In such research, a 1-D nanobeam containing a cavity region sandwiched by two mirror regions is one of the most common designs. However, searching bandgaps for suitable operation modes and the need for the mirror region are limitations in the device design. Therefore, we introduce the slow sound mode as the operating acoustic mode and use an acoustic potential well to further trap the phonons in the cavity. Three types of structures are introduced to investigate the effect of the potential well. The products of the mode frequencies and the quality factors of the modes are used to demonstrate the performance of the structures. The displacement field and the strain field show the concentrated slow sound modes of the potential wells and produce high quality factors.
    Type of Medium: Online Resource
    ISSN: 2073-4352
    URL: Article
    DOI: 10.3390/cryst13010095
    Language: English
    Publisher: MDPI AG
    Publication Date: 2023
    detail.hit.zdb_id: 2661516-2
    Location Call Number Limitation Availability
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