UV Photonic-Integrated-Circuits-Based Structured Illumination Microscopy With a Field of View Larger than $100\,\mu \text{m}^{2}$
2023; IEEE Photonics Society; Volume: 29; Issue: 4: Biophotonics Linguagem: Inglês
10.1109/jstqe.2023.3243776
ISSN1558-4542
AutoresChupao Lin, David Schaubroeck, Roel Baets, Nico Boon, Nicolas Le Thomas,
Tópico(s)Optical Coherence Tomography Applications
ResumoPhotonic integrated circuits (PICs) are expected to add practicality and new functionalities in a considerable number of optical applications, including optical microscopy. Here, we present a PIC design allowing a far-field structured UV illumination pattern with a fringe period as low as 370 nm, a fringe visibility of 0.83 over field of views of more than $150\,\mu m\times 200\,\mu m$ and a radiant intensity as large as 0.49 mW. The circuits include single mode waveguides with propagation losses of 3 dB/cm at a wavelength $\lambda =360\,nm$ , two diffraction gratings for beam shaping out of the chip plane, a beam splitter and a phase shifter. Using fluorescent gratings with pitches longer or shorter than the wavelength, as control objects, and a collecting lens with a numerical aperture of 0.5, the current PICs enable to highlight experimentally the Moiré pattern at the heart of the optical resolution enhancement and to achieve a doubling of the optical resolution in the direction of the illumination.
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