Research Article

Impact of Nanograting Phase-Shift on Light Absorption Enhancement in Plasmonics-Based Metal-Semiconductor-Metal Photodetectors

Figure 4

Schematic diagrams of different Au nanogratings (a) without the phase shift and (b) with the phase shift, 𝛿 ≡ 2 𝜋 𝑥 𝑔 𝑝 / Λ . (c) General trapezoidal-shaped nanograting profile, with the aspect ratio defined as the trapezoid top-to-bottom base ratio.
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(a)
504530.fig.004b
(b)
504530.fig.004c
(c)