Figure 5
From: On-chip wireless silicon photonics: from reconfigurable interconnects to lab-on-chip devices

Comparison of wireless and guided 12-port crossings. (a, b) Two different utilities of the device. (c, d) SEM images and measured transmission efficiency for the receiving ports at 0°, 30°, 60° and 90° associated with the fabricated (c) wireless and (d) guided implementations of the device (that is, dashed connections inside the gray circles).