  We study terahertz transmission through nano-patterned vanadium dioxide thin
film. It is found that the patterning allows the lowering of the apparent
transition temperature. For the case of the smallest width nano antennas, the
transition temperature is lower by as many as ten degrees relative to the bare
film, so that the nano patterned hysteresis curves completely separate
themselves from their bare film counterparts. This early transition comes from
the one order of magnitude enhanced effective dielectric constants by nano
antennas. This phenomenon opens up the possibility of transition temperature
engineering.
