Optical windows are provided that transmit light such as deep-UV (DUV) light. An exemplary window includes a window substrate that is transmissive to at least one wavelength of the light. The window substrate has an incidence surface decorated with sub-wavelength asperities arranged so as to render the incidence surface solvophobic to the light-transmissive liquid. The arrangement of sub-wavelength asperities can be configured to render the incidence surface super-solvophobic to the liquid. The sub-wavelength asperities can have any of various shapes and combinations thereof, and can be regularly or irregularly arranged.