  We report on transport properties of monolayer graphene with a laterally
modulated potential profile, employing striped top gate electrodes with
spacings of 100 nm to 200 nm. Tuning of top and back gate voltages gives rise
to local charge carrier density disparities, enabling the investigation of
transport properties either in the unipolar (nn') or the bipolar (np') regime.
In the latter pronounced single- and multibarrier Fabry-Perot (FP) resonances
occur. We present measurements of different devices with different numbers of
top gate stripes and spacings. The data are highly consistent with a phase
coherent ballistic tight binding calculation and quantum capacitance model,
whereas a superlattice effect and modification of band structure can be
excluded.
