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Summary form only given. The size of optical devices is limited to wavelength-order due to diffraction. Metal is known as a negative dielectric (ND) at visible and IR range. For example, coupled surface plasmon polariton (SPP) in thin metal gap structure (ND gap) is a 2D optical wave. In the previous studies, we have shown that 2D optical wave in ND gap can be confined and guided in a nanometer-order core structure. We stress that a 2D optical waveguide is not a conventional waveguide, but principally a new one. Here, we report the experimental results of 2D optical waveguide. We measured the propagation loss of a 2D optical wave in NDgap.