A new type of light waveguide using linearly aligned pinholes is presented. Results of basic experiments are compared with theoretical estimates calculated using continuous model. Since this waveguide utilizes no transparent material, it can be used to guide electromagnetic waves of wide wavelength ranges as well as other waves such as matter waves.
Makoto, M. (2014). Guiding of light with pinholes. International Journal of Physical Sciences, 9(20), 444–453. https://doi.org/10.5897/ijps2014.4193