We present a design for a subwavelength C-shaped optical waveguide with a $90°$ junction that efficiently transports light while maintaining tight confinement with an exit spot size of $\lambda ∕7$ . Finite-difference time-domain simulations of perfect electric conductors and Au C-aperture waveguides are performed for optical frequencies. A design resonant near $780\mathrm{nm}$ is presented, with a spot size of $107\mathrm{nm}\times 107\mathrm{nm}$ and an energy density enhancement factor of 10 for a bent waveguide of total length $1.4\mathrm{\mu }\mathrm{m}$ .