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. 2018 Feb 1;8:2036. doi: 10.1038/s41598-017-18737-5

Figure 1.

Figure 1

A schematic for our HMM. (a) 10 alternating layers of N-doped Si (yellow) and Si (blue), integrated with Si grating containing periodic air holes (blue). The period (a) is 500 nm, the height of hole is given by (h) while the diameter is given by (d). The effective permittivities are defined such that ε|| is along the x and z-axis while ε⊥ is along the y axis. (b) Parallel (blue) and perpendicular (red) effective permittivity of N-doped Si/Si HMM using equations 1 and 2. (c,d) R (blue), T (black) and A (red) for bulk effective medium of N-doped Si/Si HMM, (c) without Si grating, and (d) with sub-hole Si grating.