  The competition between intrinsic disorder in superconducting
YBa$_{2}$Cu$_{3}$O$_{7-\delta}$ (YBCO) thin films and an ultradense triangular
lattice of cylindrical pinning centers spaced at 30 nm intervals results in an
ordered Bose glass phase of vortices. The samples were created by scanning the
focused beam of a helium-ion microscope over the surface of the YBCO thin film
to form columns of point defects where superconductivity was locally
suppressed. The voltage-current isotherms reveal critical behavior and scale in
the vicinity of the second-order glass transition. The latter exhibits a
distinct peak in melting temperature ($T_g$) vs. applied magnetic field ($B_a$)
at the magnetic commensurability field, along with a sharp rise in the
lifetimes of glassy fluctuations. Angle-dependent magnetoresistance
measurements in constant-Lorentz-force geometry unveil a strong increase in
anisotropy compared to a pristine reference film where the density of vortices
matches that of the columnar defects. The pinning is therefore, dominated by
the magnetic-field component parallel to the columnar defects, exposing its
one-dimensional character. These results support the idea of an ordered Bose
glass phase.
