Fig. 5

MIR nanophotonic building blocks.a Waveguide bends (Reproduced with permission from [105]). b Tapered fiber-to-chip coupler (Reproduced with permission from [105]). c Directional coupler. d 1D grating slow light waveguide (Reproduced with permission from [96]). e 2D PhC slow light waveguide (Reproduced with permission from [97]). f Add-drop filter (Reproduced with permission from [143]). g Multimode interferometer (Reproduced with permission from [143]). h Grating coupler with releasing holes. i Nanocavities, (i) with tapered hole radius (Reproduced with permission from [127]), (ii) aperiodic deterministic nanobeam (Reproduced with permission from [128]). j Black-phosphorus-based waveguide integrated on-chip photodetector, (i) schematic of the device, (ii) optical image. (Reproduced with permission from [131])