https://p450inhibitors.com/ind....ex.php/ssr-tvd-spati
By patterning a hybrid diffractive Fresnel zone plate construction on a partially milled microsphere using a focused ion beam, wavelength-dependent changing between mono-focal and multi-focal functionalities can be achieved. Generation of on-axis tri-foci and mono-focus light fields under large numerical-aperture ($\gt $NA0.67) problems at two working wavelengths (405 nm and 808 nm) have now been shown both numerically and experimentally.In this Let
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