Publishing type：Research paper (scientific journal)   International / domestic magazine：International journal  

Fluorescent dye films on transparent substrates are essential for OLEDs, flexible displays, X-ray detection, and wireless optical communications. However, their efficiency is often hampered by fluorescence trapping due to total internal reflection (TIR) and waveguiding. This study tackles this longstanding challenge by reconceptualizing the integration of dye films with nanoantenna metasurfaces. Traditional methods involve directly spin-coating films onto c-Si metasurfaces on quartz substrates, resulting in edge luminescence and weak inner signals. We present a straightforward, adjustable approach by integrating dye films on the opposite side of quartz substrates, reaching a 2.5-fold photoluminescence enhancement and improving the uniformity of the emission compared to the conventional methods. These gains stem from redirecting a significant portion of leaked fluorescence light trapped inside the substrate into free space, surpassing TIR conditions through in-plane diffraction orders of the metasurfaces across the full RGB spectrum. Our findings facilitate the design of more efficient luminescent devices.

DOI： 10.1021/acs.nanolett.4c03294

PubMed

Publishing type：Research paper (scientific journal)  

DOI： 10.1002/adpr.202400050

Publishing type：Research paper (scientific journal)   International / domestic magazine：International journal  

This work presents a bulk refractive index sensor based on quasi-bound states in the continuum (BICs) induced by broken symmetries in metasurfaces. The symmetry is broken by detuning the size and position of silicon particles periodically arranged in an array, resulting in multiple quasi-BIC resonances. We investigate the sensing characteristics of each of the resonances by measuring the spectral shift in response to changes in the refractive index of the surrounding medium. In addition, we reveal the sensing range of the different resonances through simulations involving a layer of deviating refractive index of increasing thickness. Interestingly, the resonances show very different responses, which we describe via the analysis of the near-field. This work contributes to the development of highly sensitive and selective BIC-based sensors that can be used for a wide range of applications.

DOI： 10.1364/OE.514787

PubMed

Publishing type：Research paper (scientific journal)   International / domestic magazine：International journal  

H-type supramolecular polymers with preferred helicity and highly efficient emission have been prepared from the self-assembly of chiral tetraphenylene-based monomers. Implementation of the one-dimensional fibers into dielectric nanoparticle arrays allows for a significant reshaping of fluorescence due to weak light-matter coupling.

DOI： 10.1039/d3cc05877h

PubMed

J-GLOBAL

property_type：Patent 

Application no：特願2022-201504 

Announcement no：特開2024-086397 

J-GLOBAL

property_type：Patent 

Application no：特願2022-098681 

Announcement no：特開2024-000114 

J-GLOBAL

property_type：Patent 

Application no：特願2022-098682 

Announcement no：特開2024-000115 

J-GLOBAL