Figure 9
(a) Waveguide layout of silicon OAM device for multiplexing five OAM modes (ℓ=+2, +1, 0, −1, −2). (b) Fabricated silicon OAM device. The optical loss value was approximately 0.4 dB cm−1. The inset shows an SEM photo of the grating42. OAM, orbital-angular momentum; SEM, scanning electron microscope.
