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DESIGNING BLACK MIRRORS
Applied Optics- received 03/06/2024; accepted 04/22/2024; posted 04/23/2024; Doc. ID 523277
- Abstract: Black mirrors or total absorbers are related to neutral density (ND) filters which areprimarily concerned with transmittance whereas a black mirror has no transmittance andendeavors to reduce the reflectance to zero in the wavelength band of interest by absorbing allthe light. Metal layers must be used for the absorptance capabilities and dielectric layers tocreate the interference phases which maximize the electric field at the absorbing layers. Aliterature search for designing ND filters came up with eight [1-8] references which supplieduseful data on the indices of refraction of metals. There is a description of black mirror designprinciples found in Ref 9. Very thin layers of metal are required whose indices of refractionvary with thickness and require special software handling in the design process. The proceduresand additional viewpoint on designing black mirrors is reported here.