A hybrid waveguide sensor comprises a dielectric layer having one optical
signal input section formed in one end thereof and one optical signal
output section formed in the other end thereof, the dielectric layer
having a predetermined size of thin metal film provided therein; a
polymer layer formed on and under the dielectric layer and having an
opening formed to expose a portion of the dielectric layer corresponding
to the thin metal film, the opening having a larger width than the thin
metal film; and a receptor layer formed on a portion of the dielectric
layer corresponding to the thin metal film exposed by the opening.