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A phenomenon directly related to 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. The tunable phase and G-H shifts are particularly important for reconfigurable photonic structures. In this work, we report 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.  We experimentally demonstrate reversible electrical tuning of phase and G-H shifts using a microheater integrated optical cavity consisting of a dielectric film on an absorbing substrate through Joule heating mechanism. In particular, we report an enhanced G-H shift of 110 times of the operating wavelength at the Brewster angle of the thin-film cavity. More importantly, we demonstrate electrically tunable G-H shifts by exploiting the significant tunable phase change that occurs at the generalized Brewster angles, due to the temperature induced small refractive index changes of the dielectric transparent film. Realizing efficient electrically tunable G-H shifts with miniaturized heaters will extend the research scope of G-H shift phenomenon and its applications."},"software":{"citation:softwareName":"Origin"},"citation:keyword":[{"citation:keywordValue":"Reconfigurable optical structures"},{"citation:keywordValue":"Thin film optical absorbers"},{"citation:keywordValue":"Chalcogenide phase change materials"},{"citation:keywordValue":"Goos-Hänchen shift"},{"citation:keywordValue":"Microheaters"},{"citation:keywordValue":"Generalized Brewster angle"}],"author":[{"citation:authorName":"Sreekanth, Kandammathe Valiyaveedu","citation:authorAffiliation":"Institute of Materials Research and Engineering, A*STAR","authorIdentifierScheme":"ORCID","authorIdentifier":"0000-0002-0254-0938"},{"citation:authorName":"Das, Chandreyee Manas","citation:authorAffiliation":"Nanyang Technological University"},{"citation:authorName":"Mishra, Mayank","citation:authorAffiliation":"Nanyang Technological University"},{"citation:authorName":"Ouyang, Qingling","citation:authorAffiliation":"Nanyang Technological University"},{"citation:authorName":"Rawat, Rajdeep Singh","citation:authorAffiliation":"Nanyang Technological University","authorIdentifierScheme":"ORCID","authorIdentifier":"0000-0002-3161-2486"},{"citation:authorName":"Yong, Ken-Tye","citation:authorAffiliation":"The University of Sydney","authorIdentifierScheme":"ORCID","authorIdentifier":"0000-0001-7936-2941"},{"citation:authorName":"Singh, Ranjan","citation:authorAffiliation":"Nanyang Technological University","authorIdentifierScheme":"ORCID","authorIdentifier":"0000-0001-8068-7428"}],"publication":[{"publicationCitation":"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), e2006926.","publicationIDType":"doi","publicationIDNumber":"10.1002/adma.202006926","publicationURL":"https://onlinelibrary.wiley.com/doi/abs/10.1002/adma.202006926"},{"publicationCitation":"Sreekanth, 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. 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