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dc.contributor.authorYaseen, Mohammad Tariqen_US
dc.contributor.authorYang, Yi-Chunen_US
dc.contributor.authorShih, Min-Hsiungen_US
dc.contributor.authorChang, Yia-Chungen_US
dc.date.accessioned2019-04-03T06:36:17Z-
dc.date.available2019-04-03T06:36:17Z-
dc.date.issued2015-10-01en_US
dc.identifier.issn1424-8220en_US
dc.identifier.urihttp://dx.doi.org/10.3390/s151025868en_US
dc.identifier.urihttp://hdl.handle.net/11536/129423-
dc.description.abstractWe numerically and experimentally investigated the lateral coupling between photonic crystal (PhC) nanobeam (NB) cavities, pursuing high sensitivity and figure of merit (FOM) label-free biosensor. We numerically carried out 3D finite-difference time-domain (3D-FDTD) and the finite element method (FEM) simulations. We showed that when two PhC NB cavities separated by a small gap are evanescently coupled, the variation in the gap width significantly changes the coupling efficiency between the two coupled NB cavities and the resulting resonant frequencies split. Experimentally, we fabricated laterally-coupled PhC NB cavities using (InGaAsP) layer on the InP substrate. For sensing, we showed that the laterally coupled PhC NB cavities sensor exhibits higher sensitivity than the single PhC NB cavity. The higher sensitivity of laterally coupled PhC NB cavities is due to the strong evanescent coupling between nearby PhC NB cavities, which depends on the gap width and it is attributed to the large confinement of the electromagnetic field in the gap (air or liquid). As a result of the lateral coupling, both even (symmetric) and odd (asymmetric) modes exist. We show that even modes are more sensitive than odd modes. In addition, higher-order modes exhibit higher sensitivity. Hence, we characterized and examined the fabricated PhC NB cavity as a label-free biosensor, and it exhibits high figure of merit due to its high Q-factor. This illustrates a potentially useful method for optical sensing at nanoscale.en_US
dc.language.isoen_USen_US
dc.subjectPhotonic crystals (PhCs)en_US
dc.subjectnanobeam (NB) cavityen_US
dc.subjectfinite-difference time-domain (FDTD)en_US
dc.subjectlabel-free sensingen_US
dc.titleOptimization of High-Q Coupled Nanobeam Cavity for Label-Free Sensingen_US
dc.typeArticleen_US
dc.identifier.doi10.3390/s151025868en_US
dc.identifier.journalSENSORSen_US
dc.citation.volume15en_US
dc.citation.issue10en_US
dc.citation.spage25868en_US
dc.citation.epage25881en_US
dc.contributor.department光電工程學系zh_TW
dc.contributor.departmentDepartment of Photonicsen_US
dc.identifier.wosnumberWOS:000364242300062en_US
dc.citation.woscount6en_US
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