Could you be more descriptive about what you are looking for?

The deck will be 20' x 20' and will block light from a basement bedroom located below it. I'd like to create a "skylight" effect by leaving a glass panel of some kind above the bedroom area. It will be about 4' x 6' area where I would ideally create a glass floor. I could perhaps use glass blocks to make a floor but am also wondering if there are glass or acrylic panels that can be used and are safe for flooring. It will not be a high traffic area so I'm not worried about it being slippery - just safe to walk on would be nice...

I've seen thick glass, and a grid of glass blocks used indoors for a similar reason.

Google "glass block floor" for lots of information, including a link to info here at houzz.

Do the same for "glass floor" for similar results.