Related Experiment Video
Updated: Jun 12, 2026

Digital Inline Holographic Microscopy (DIHM) of Weakly-scattering Subjects
Published on: February 8, 2014
Zero-reflectivity homogeneous layers and high spatialfrequency surface-reliefgratings on lossy materials
Abstract:
The required thickness and complex refractive index of single homogeneous layers on lossy substrates to produce zero reflectivity are calculated by a rigorous impedance matching approach. The analysis is applicable to both TE and TM polarization and to any angle of incidence. The filling factor and groove depth of a rectangular-groove grating, equivalent to a single homogeneous lossy layer in the long-wavelength limit, are calculated. The method reduces to that previously found for dielectric surface-relief gratings in the limit of no losses. The antireflection behavior of the gratings is verified using the rigorous (without approximations) coupled-wave analysis of metallic surface-relief grating diffraction. It is shown that multiple zeroreflectivity solutions exist for both TE and TM polarizations and for any angle of incidence for an arbitrary complex-refractive-index substrate. Example zero-reflectivity gold gratings for incident free space wavelengths from 0.44 to 12.0 microm are presented.
Related Concept Videos
Boundary Conditions: Lossless Lines
At the receiving end, the boundary condition states that the voltage equals the product of the receiving-end impedance and current. This relationship is expressed as a function of the incident and...
Reconstruction of Signal using Interpolation
Confocal Fluorescence Microscopy
Traveling Waves: Lossless Lines
Aliasing
If the sampling frequency is below the Nyquist rate, these replicas overlap, preventing the original signal...
Total Internal Reflection Fluorescence Microscopy
