Effective Refractive-Index Approximation: A Link between Structural and Optical Disorder of Planar Resonant Optical Structures

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dc.citation.issue6
dc.citation.rankM21
dc.citation.spage064041
dc.citation.volume9
dc.contributor.authorGačević, Žarko
dc.contributor.authorVukmirović, Nenad
dc.date.accessioned2024-07-01T13:51:28Z
dc.date.available2024-07-01T13:51:28Z
dc.date.issued2018-06-27
dc.description.abstractWe provide detailed insights into a link between structural and optical disorder of resonant optical structures, in particular, distributed Bragg reflectors (DBRs) and resonant microcavities (μCs). The standard (targeted) DBR structures have periodic square-wave-like refractive-index profiles, and their optical performance is determined by the refractive-index ratio of the two applied materials (n12=n1/n2, n1>n2) and the number of DBR periods (N). It is well known that its structural disorder strongly affects its optical properties, but, despite that, this influence has not been quantitatively addressed in the literature. We propose a precise quantitative definition for a structural disorder of a single DBR unit cell (disorder factor DF), completing the set of DBR fundamental parameters (n12, N, DF). Then we expose the basis for the effective refractive-index approximation (ERIA), showing that, as long as DBR optical properties are concerned, the influence of increasing structural disorder (DF↑) is virtually identical to the influence of decreasing refractive-index ratio (n12↓), with the latter influence being easily quantified. Making use of the ERIA method, simple analytical formulas, which enable rapid insights into the reflectivity and stop-band width of DBRs with different types of transient layers at the heterointerfaces, are derived and the results validated, via both transfer-matrix simulations and direct experimental measurements of imperfect DBRs. The insights of the ERIA method are then further applied on resonant μCs, providing a comprehensive link between their structural disorder and subsequent deterioration of their quality (Q) factor.
dc.identifier.doi10.1103/physrevapplied.9.064041
dc.identifier.issn2331-7019
dc.identifier.scopus2-s2.0-85049589231
dc.identifier.urihttps://pub.ipb.ac.rs/handle/123456789/165
dc.identifier.wos000436563200001
dc.language.isoen
dc.publisherAmerican Physical Society
dc.relation.ispartofPhysical Review Applied
dc.relation.ispartofabbrPhys. Rev. Appl.
dc.rightsrestrictedAccess
dc.titleEffective Refractive-Index Approximation: A Link between Structural and Optical Disorder of Planar Resonant Optical Structures
dc.typeArticle
dc.type.versionpublishedVersion
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