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Chalcogenide Microsphere-Assisted Optical Super-Resolution Imaging
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DOI：10.1002/adom.202102269.png)
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Abstract
En 中文
Microsphere-assisted optical imaging has been proved straightforward and cost-effective for super-resolution imaging in material science and biomedical research. Optically transparent microspheres with a high refractive index are critical for achieving superior super-resolution capabilities yet remain to be further exploited. Here, the use of As2S3 (an optically transparent chalcogenide glass) microspheres, with a refractive index as high as 2.31 (at 600 nm) and diameters ranging from 10 to 215 mu m, for optical super-resolution imaging is reported. Under white-light illumination (peaked at 646 nm), As2S3 microspheres full-immersed in polymethyl methacrylate or immersion oil generate super-resolved virtual images of nanostructures (approximate to 90 nm in minimum feature size) with a magnification up to 8x. The lateral resolution of full-immersed microspheres, which can be as low as approximate to 172 nm for a 19 mu m diameter As2S3 microsphere, is also investigated. Moreover, super-resolved real imaging of nanostructures with semi-immersed As2S3 microspheres is demonstrated for the first time. Compared with the full-immersion approach (e.g., for a 30 mu m diameter microsphere, the image plane is approximate to 30 mu m underneath the specimen with a magnification of 4.3x), the semi-immersion approach provides an obvious improvement in the magnification (6.6x) and a much longer operation distance to the objective (the image plane is approximate to 140 mu m above the specimen).
Keywords:
chalcogenide microspheres
edge spread function
photonic nanojets
point spread function
super-resolution imaging