This study details a theoretical analysis of leaky and waveguide modes in biperiodic all-dielectric holograms. By tuning diffraction orders and subsequently confining local density of optical states at two distinct resonance wavelengths, we present a new class of highly sensitive refractive index biosensing platforms that are capable of resolving 35.5 to 41.3 nm/RIU of spectral shift for two separate biological analytes.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8155016 | PMC |
| http://dx.doi.org/10.1038/s41598-021-89971-1 | DOI Listing |
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This work presents the generation of an Airy beam by a leaky-wave structure (LWS) designed from a substrate-integrated waveguide (SIW) with dimension-varying slots. The Airy beam is radiated by judiciously designing the length of the slots to modulate the phase distribution. Compared to Airy beams generated by phased array antennas or metasurfaces, no complex feeding network associated with phase shifters and no space-wave illumination is required, thus allowing one to reach a low-profile structure.
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Nanophotonics
February 2024
Theoretical Quantum Physics Laboratory, Cluster for Pioneering Research, RIKEN, Wakoshi, Saitama 351-0198, Japan.
Article Synopsis
- The study demonstrates the application of machine learning for classifying topological phases in finite leaky photonic lattices using minimal measurement data.
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Extensive Q-factor tuning for leaky modes with minimal frequency variation in asymmetric slab grating structures.
Sci Rep
December 2024
Divison of Applied Photonics System Research, Advanced Photonics Research Institute, GIST, Gwangju, 61005, Republic of Korea.
We investigated an asymmetric slab grating structure to achieve significant tuning of the quality (Q) factor for a leaky mode while minimizing frequency variation. This structure comprises two identical gratings placed on the top and bottom of a slab waveguide, with one grating laterally shifted to introduce asymmetry. Simulations demonstrate that lateral shifting of one grating induces extensive changes in the Q-factor with minimal frequency variation, particularly near the band-flip filling fraction because the band-flip filling fraction remains unaffected by the shifting.
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Ultrasonics
March 2025
Hochschule Offenburg - University of Applied Sciences, Klosterstr. 14, 77723 Gengenbach, Germany.
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