Several applications of optical tunneling (frustrated total reflection) are briefly discussed. There are several classes of optical bandpass filters which use optical tunneling: the Fabry-Perot filter (alias the FTR filter), the single tunnel layer filter, and the multiple tunnel layer filter. The properties of these filters are examined. The multiple tunnel layer filter shows promise as an ir long-wave pass filter.
Philip W. Baumeister, "Optical Tunneling and Its Applications to Optical Filters," Appl. Opt. 6, 897-905 (1967)