Abstract
Nanostructured, sub-wavelength anti-reflection layers (NALs) have attracted much attention as a new generation of anti-reflection surfaces. Among different designs, sub-wavelength periodic nanostructures are capable of enhancing transmission of coherent light through an interface without inducing scattering. In this work, we have explored a new profile for periodic NALs capable of transmitting IR light with higher efficiency compared to NALs based on a parabolic profile. To achieve high transmission and low diffraction, the profile and pitch of the nanostructured NALs are calculated using a combination of a multi-layer modeling and Rigorous Coupled Wave (RCWA) analysis.
Highlights
Traditional anti-reflection coatings (ARCs) are based on destructive interference of light from two or more interfaces [1] [2]
To achieve high transmission and low diffraction, the profile and pitch of the nanostructured NALs are calculated using a combination of a multi-layer modeling and Rigorous Coupled Wave (RCWA) analysis
One can reduce the reflection by gradually increasing the refractive index from air to substrate
Summary
Traditional anti-reflection coatings (ARCs) are based on destructive interference of light from two or more interfaces [1] [2]. Nanostructured ARC layers (NALs [9]) on the other hand, work by a gradual, adiabatic change of effective refractive index from that of the incidence medium (air) to that of the bulk material (silicon in our case). These structures are referred as moth-eye structures [10] due to their resemblance to the surface of a moth’s eye [11]. This work is done at Center for High Technology Materials (CHTM) at University of New Mexico
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