Fig. 1
From: Flexible integration of free-standing nanowires into silicon photonics
Integration of a FNW into a silicon chip using side-by-side near-field optical coupling. a Schematic illustration of the coupling scheme. The white arrows indicate the direction of light propagation. b Upper panel: scanning electron microscopy (SEM) images of a 730-nm-diameter CdS FNW coupled to 280-nm-width SWs at both ends. Scale bar, 10 μm. Lower panel: close-up image showing the pre-defined coupling length of about 2.3 μm. Scale bar, 2 μm. c Photograph of the measurement setup under an optical microscope. The silicon chip was illuminated by the microscope. d Measured coupling efficiency between a 860-nm-diameter CdS FNW and SWs with widths of 280, 300, and 320 nm, respectively. The coupling lengths are about 2.5 μm
