Figure 6
From: On-chip wireless silicon photonics: from reconfigurable interconnects to lab-on-chip devices
Experimental electrically reconfigurable beam steering. (a) SEM image of the nanoheaters with their corresponding pads and the underlying feeding waveguides. (b) SEM image of the waveguides used to feed the 4-antenna emitting array (colored arrows indicate the waveguides paths in a and b). (c) SEM image of the receiving subsystem consisting of seven antennas placed at different angles. The antennas at 75°, 90° and 105° are taken as the device output ports. The values of α that allow us to steer the beam to each of these ports were estimated to be −158°, 0° and 158°, respectively (Supplementary Information). (d) Total array gain associated with each receiving antenna (d=100 μm, λ=1550 nm) for the three values of α. Circles indicate measured values at each antenna position. The crosstalk at the output ports is highlighted, with values always higher than 8 dB. (e, f) Simulated total array gain associated with two different wireless 1 × N switches for each of the N optimized values of α (each with a different color). The zeros of the corresponding radiation diagrams determine the N angles at which the receiving antennas are located. At each of these positions, the radiated power is zero for all values of α except one, for which the radiated power is almost maximum (marked with a circle). (e) N=4. (f) N=9.
