Optical super-resolution imaging by high-index microspheres embedded in elastomers

Arash Darafsheh, Consuelo Guardiola, Averie Palovcak, Jarod C. Finlay, Alejandro Cárabe

Research output: Contribution to journalArticlepeer-review

149 Scopus citations


We demonstrated feasibility of super-resolution imaging through high-index microspheres embedded in transparent elastomers. We performed imaging, with resolution improvement by a factor of two, by using implanted barium titanate glass microspheres (diameters ∼30-150 μm and refractive index ∼1.9-2.1) in a thin film of polydimethylsiloxane elastomer placed over the specimen. Microsphere-assisted imaging technique is a promising candidate for applications in cancer research. As a proof-of-principle, we used microsphere-assisted imaging technique for the observation of radiation-induced γ-H2AX foci formation in U87 human glioblastoma cells irradiated by clinical proton beams.

Original languageEnglish
Pages (from-to)5-8
Number of pages4
JournalOptics Letters
Issue number1
StatePublished - Jan 1 2015


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