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dc.contributor.authorCheng, Pi-Juen_US
dc.contributor.authorChang, Shu-Weien_US
dc.date.accessioned2019-04-03T06:48:01Z-
dc.date.available2019-04-03T06:48:01Z-
dc.date.issued2016-01-01en_US
dc.identifier.isbn978-1-62841-977-1en_US
dc.identifier.issn0277-786Xen_US
dc.identifier.urihttp://dx.doi.org/10.1117/12.2210760en_US
dc.identifier.urihttp://hdl.handle.net/11536/135906-
dc.description.abstractOptical isolators are important devices in photonic circuits. To reduce the unwanted reflection in a robust manner, several setups have been realized using nonreciprocal schemes. In this study, we show that the propagating modes in a strongly-guided chiral photonic crystal (no breaking of the reciprocity) are not backscattering-immune even though they are indeed insensitive to many types of scatters. Without the protection from the nonreciprocity, the backscattering occurs under certain circumstances. We present a perturbative method to calculate the backscattering of chiral photonic crystals in the presence of chiral/achiral scatters. The model is, essentially, a simplified analogy to the first-order Born approximation. Under reasonable assumptions based on the behaviors of chiral photonic modes, we obtained the expression of reflection coefficients which provides criteria for the prominent backscattering in such chiral structures. Numerical examinations using the finite-element method were also performed and the results agree well with the theoretical prediction. From both our theory and numerical calculations, we find that the amount of backscattering critically depends on the symmetry of scatter cross sections. Strong reflection takes place when the azimuthal Fourier components of scatter cross sections have an order l of 2. Chiral scatters without these Fourier components would not efficiently reflect the chiral photonic modes. In addition, for these chiral propagating modes, disturbances at the most significant parts of field profiles do not necessarily result in the most effective backscattering. The observation also reveals what types of scatters or defects should be avoided in one-way applications of chiral structures in order to minimize the backscattering.en_US
dc.language.isoen_USen_US
dc.subjectPhotonic crystalen_US
dc.subjectBackscatteringen_US
dc.subjectChiral opticsen_US
dc.titleCriteria of backscattering in chiral one-way photonic crystalsen_US
dc.typeProceedings Paperen_US
dc.identifier.doi10.1117/12.2210760en_US
dc.identifier.journalPHYSICS AND SIMULATION OF OPTOELECTRONIC DEVICES XXIVen_US
dc.citation.volume9742en_US
dc.citation.spage0en_US
dc.citation.epage0en_US
dc.contributor.department光電工程學系zh_TW
dc.contributor.departmentDepartment of Photonicsen_US
dc.identifier.wosnumberWOS:000381930800016en_US
dc.citation.woscount0en_US
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