  We show that electric field on the plane surface of truncated sphere or
cylinders (so called Janus particles) have sharp resonances versus the depth of
removed segment of a sphere or cylinder. These resonances are related to the
excited whispering gallery waves caused by truncation. It is a new mechanism of
the field localization. Optimization of this effect for cylinders permits to
reach a super resolution in the line thickness what can be used for contacting
optical lithography.
