A hybrid Bloch surface polarized waveguide comprising a dielectric nanowire incorporated at the top of a photonic crystal slab with a sandwiched dielectric arc groove is proposed, and the guiding properties of which are theoretically investigated at the telecommunication wavelength. The introduction of the arc groove offers additional freedom for tuning the supported hybrid mode. By properly choosing the geometrical parameters of the structure, the modified hybrid waveguide could feature significantly enhanced field confinement ability combined with long-range propagation length. The proposed waveguide is shown to be able to enable obviously improved optical guiding performance over the conventional hybrid Bloch surface waveguide due to the tight hybridization of the dielectric mode and the Bloch surface mode in the groove gap. The structure being studied is expected to open up a new route for high-performance photonic integrated devices.
In aims to enhance the electric-field confinement capability of Bloch surface wave (BSW) with low propagation loss, here, we develop a high-performance hybrid BSW waveguide that incorporates a high-index nano-ridge loaded photonic crystal slab with a silicon dielectric nanowire. Leveraging the mode hybridization, a subwavelength mode confinement in conjunction with long-range waveguiding is achievable. Its robust properties against the possible fabrication imperfection for practical implementations and comparisons with similar hybrid waveguide configurations are also discussed to indicate the improved guiding performance of our proposed waveguide. These remarkable optical properties render such waveguide to hold the promise of building numerous high-performance nanophotonic devices.
In order to further enhance the electric field confinement ability of the Bloch surface polariton waveguides, here, a new hybrid Bloch surface polariton waveguide is proposed to reduce the mode size while still maintaining the long-range transmission distance of the conventional Bloch surface polariton waveguide. By incorporating an ellipse dielectric nanowire with the photonic crystal slab combined with a sandwiched dielectric nano-ridge, the weak mode confinement ability of the Bloch surface polariton mode can be compensated effectively. For the considered structural parameters, the modal properties of the hybrid waveguide are quantitatively investigated to demonstrate subwavelength mode confinement ability along with ultra-low propagation loss. The nice optical performance of the presented hybrid waveguide structure could serve as a promising building block for many high-performance integrated optical devices.
ere we report a high-sensitive Bloch surface wave sensor by integrating a graphene metasurface and a truncated one dimensional (1D) photonic crystal (PC) multilayer structure. The device is configured to be able to excite BSW mode accompanied with a sharp resonance dip, aiming at greatly enhanced sensing performance of the device structure. The sensing capability of the proposed sensor device is theoretically evaluated by investigating the excited mode properties. The result shows that the graphene metasurface coated Bloch surface wave sensor can reach superior detection sensitivity, thus could offer an obvious promotion for improving the performance of Bloch surface wave based sensing applications.
Here we report a hybrid Bloch surface polariton waveguide by integrating a silicon nano-rib loaded periodic multilayer dielectric structure with a dielectric nanowire at telecommunication wavelength. The hybridization between the Bloch surface mode and dielectric mode is investigated by tuning the key structural parameters of the proposed waveguide. Owing to the existence of the silicon non-rib in close proximity to the dielectric nanowire, the characteristics of the Bloch surface mode can be strongly modified, enabling low-loss light guiding in conjunction with subwavelength mode confinement. Such hybrid configuration demonstrates significant superior light guiding properties over the conventional Bloch surface polaritons and nanowire polaritons, which may open possibilities of the implementation of a variety of high-performance integrated photonic components.
The reflected intensity change of the Bloch-surface-wave (BSW) resonance influenced by the loss of a truncated onedimensional photonic crystal structure is numerically analyzed and studied in order to enhance the sensitivity of the Bloch-surface-wave-based sensors. The finite truncated one-dimensional photonic crystal structure is designed to be able to excite BSW mode for water (n=1.33) as the external medium and for p-polarized plane wave incident light. The intensity interrogation scheme which can be operated on a typical Kretschmann prism-coupling configuration by measuring the reflected intensity change of the resonance dip is investigated to optimize the sensitivity. A figure of merit (FOM) is introduced to measure the performance of the one-dimensional photonic crystal multilayer structure under the scheme. The detection sensitivities are calculated under different device parameters with a refractive index change corresponding to different solutions of glycerol in de-ionized (DI)-water. The results show that the intensity sensitivity curve varies similarly with the FOM curve and the sensitivity of the Bloch-surface-wave sensor is greatly affected by the device loss, where an optimized loss value can be got. For the low-loss BSW devices, the intensity interrogation sensing sensitivity may drop sharply from the optimal value. On the other hand, the performance of the detection scheme is less affected by the higher device loss. This observation is in accordance with BSW experimental sensing demonstrations as well. The results obtained could be useful for improving the performance of the Bloch-surface-wave sensors for the investigated sensing scheme.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.