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    Area of Science:

    • Optical Microscopy
    • Nanotechnology
    • Biophysics

    Background:

    • Stimulated emission depletion (STED) microscopy offers super-resolution imaging.
    • Solid immersion lenses (SILs) can enhance optical system performance.
    • Combining STED with SILs presents an opportunity for improved resolution.

    Purpose of the Study:

    • To investigate the feasibility of STED microscopy utilizing a solid immersion lens.
    • To theoretically and experimentally evaluate the resolution enhancement capabilities of the SIL-STED system.
    • To demonstrate the system's potential for nano-scale surface imaging of biological specimens.

    Main Methods:

    • Theoretical analysis using a vectorial field algorithm for a stratified medium (SIL air-gap and sample).
    • Numerical simulations to predict resolution based on evanescent wave utilization.
    • Experimental imaging of 20 nm fluorescent beads and actin filaments.

    Main Results:

    • Simulations confirmed that evanescent waves in the SIL air-gap enable higher resolution than conventional confocal microscopy.
    • Experimental imaging achieved a lateral resolution of 34 nm on 20 nm fluorescent beads.
    • The system demonstrated nano-scale surface imaging capabilities for biological samples.

    Conclusions:

    • STED microscopy with a solid immersion lens is feasible and provides enhanced resolution.
    • The system shows significant promise for high-resolution imaging of biological surfaces at the nanoscale.
    • Further optimization of depletion beam parameters can lead to even higher resolution.