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dc.contributor.authorSreekanth, Kandammathe Valiyaveeduen_US
dc.contributor.authorDas, Chandreyee Manasen_US
dc.contributor.authorMedwal, Rohiten_US
dc.contributor.authorMishra, Mayanken_US
dc.contributor.authorOuyang, Qinglingen_US
dc.contributor.authorRawat, Rajdeep Singhen_US
dc.contributor.authorYong, Ken-Tyeen_US
dc.contributor.authorSingh, Ranjanen_US
dc.identifier.citationSreekanth, K. V., Das, C. M., Medwal, R., Mishra, M., Ouyang, Q., Rawat, R. S., Yong, K. & Singh, R. (2021). Electrically tunable singular phase and Goos–Hänchen shifts in phase-change-material-based thin-film coatings as optical absorbers. Advanced Materials, 33(15), 2006926-.
dc.description.abstractThe change of the phase of light under the evolution of a nanomaterial with time is a promising new research direction. A phenomenon directly related to the sudden phase change of light is the Goos-Hänchen (G-H) shift, which describes the lateral beam displacement of the reflected light from the interface of two media when the angles of incidence are close to the total internal reflection angle or Brewster angle. Here, an innovative design of lithography-free nanophotonic cavities to realize electrically tunable G-H shifts at the singular phase of light in the visible wavelengths is reported. Reversible electrical tuning of phase and G-H shifts is experimentally demonstrated using a microheater integrated optical cavity consisting of a dielectric film on an absorbing substrate through a Joule heating mechanism. In particular, an enhanced G-H shift of 110 times of the operating wavelength at the Brewster angle of the thin-film cavity is reported. More importantly, electrically tunable G-H shifts are demonstrated by exploiting the significant tunable phase change that occurs at the Brewster angles, due to the small temperature-induced refractive index changes of the dielectric film. Realizing efficient electrically tunable G-H shifts with miniaturized heaters will extend the research scope of the G-H shift phenomenon and its applications.en_US
dc.description.sponsorshipAgency for Science, Technology and Research (A*STAR)en_US
dc.description.sponsorshipMinistry of Education (MOE)en_US
dc.description.sponsorshipNational Research Foundation (NRF)en_US
dc.relationNRF2017-ANR002 2DPSen_US
dc.relation.ispartofAdvanced Materialsen_US
dc.rightsThis is the peer reviewed version of the following article: "Sreekanth, K. V., Das, C. M., Medwal, R., Mishra, M., Ouyang, Q., Rawat, R. S., . . . Singh, R. (2021). Electrically Tunable Singular Phase and Goos–Hänchen Shifts in Phase-Change-Material-Based Thin-Film Coatings as Optical Absorbers. Advanced Materials, 33(15), 2006926-, which has been published in final form at This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions.en_US
dc.titleElectrically tunable singular phase and Goos–Hänchen shifts in phase-change-material-based thin-film coatings as optical absorbersen_US
dc.typeJournal Articleen
dc.contributor.schoolSchool of Physical and Mathematical Sciencesen_US
dc.contributor.schoolSchool of Electrical and Electronic Engineeringen_US
dc.contributor.researchCentre for Disruptive Photonic Technologies (CDPT)en_US
dc.contributor.researchThe Photonics Instituteen_US
dc.contributor.researchCNRS International NTU THALES Research Alliancesen_US
dc.description.versionAccepted versionen_US
dc.subject.keywordsChalcogenide Phase-Change Materialsen_US
dc.subject.keywordsGeneralized Brewster Angleen_US
dc.subject.keywordsGoos–Hänchen Shiften_US
dc.subject.keywordsReconfigurable Optical Structuresen_US
dc.subject.keywordsThin-Film Optical Absorbersen_US
dc.description.acknowledgementK.V.S. and R.S. acknowledge the funding support from Singapore Ministry of Education (MOE) grant numbers AcRF MOE2016-T3-1-006 and MOE AcRF Tier 1 RG96/19 and Advanced Manufacturing and Engineering (AME) Programmatic grant (A18A5b0056) by Agency for Science, Technology and Research (A*STAR). R.M. and R.S.R. would like to acknowledge the Ministry of Education (MOE) through Tier 2 grants (2019-T2-1-058). In addition, C.M.D. and K.T.Y. acknowledge the funding support from Singapore National Research Foundation (NRF) and French National Research Agency (ANR), grant number (NRF2017-ANR002 2DPS).en_US
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