The wood was eliminated due to several factors. Maintanance was high and it could cause grevious injurys from 'shrapnel' in explosions.
I imagine modern decks are steel with some kind of coating applied though I dont know exactly what is used.
This is about the best I could find on the topic.
http://www.dt.navy.mil/sur-str-mat/f...coa/index.html
Anyhow more of a friendly bump than help
I'm sure someone who actually knows or has walked on one will chime in.