Infrared (IR) transmissive moth eye-like substrates, including randomly patterned fused silica and various periodically patterned germanium substrates, were surface modified using a simple process.  Goniometric analysis showed that the surface modification altered the surface wettability of each substrate, rendering them superhydrophobic.  Following the surface modification, it was determined that the desirable IR transmission and anti-reflective properties of each substrate type were maintained.  Furthermore, the hydrophobicity, IR transmission and anti-reflective capabilities of the substrates were shown to be significantly enhanced in comparison to native, non-moth eye fused silica and germanium substrates that underwent the same processes.  The results of this work provide an opportunity for the development of enhanced utility infrared transmissive optics in wet or humid conditions.

Superhydrophobic, infrared transmissive moth eye-like substrates for use in wet conditions

254th National Meeting (2017)

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