Table 1 Performances of various nonlinear materials for microcomb generation.
From: Ultra-efficient frequency comb generation in AlGaAs-on-insulator microresonators
Material | Refractive index | n2 (m2 W−1) | Mode area (µm2) | Highest Q for comb generation | Lowest threshold power (mW) (FSR) |
|---|---|---|---|---|---|
Silica38 (Wedge disk) | 1.45 | 3 × 10−20 | ∼60 | 6.7 × 108 | 1.2 (9.3 GHz) |
Silica21 (Microtoroid) | ∼10 | 1.2 × 108 | 0.17 (1 THz) | ||
Si3N414 | 2.0 | 2.5 × 10−19 | ∼1.5 | 3.7 × 107 | 0.33 (200 GHz) |
LiNbO319 | 2.21 | 1.8 × 10−19 | ∼1 | 2.2 × 106 | 4.2 (199.7 GHz) |
Ta2O550 | 2.05 | 6.2 × 10−19 | ∼1.5 | 3.2 × 106 | 10 (500 GHz) |
Hydex51 | 1.7 | 1.15 × 10−19 | ∼2 | 1 × 106 | 50 (200 GHz) |
Si52 | 3.47 | 5 × 10−18 | ∼2 | 5.9 × 105 | 3.1 (127 GHz) |
GaP53 | 3.05 | 6 × 10−18 | ∼0.15 | 3 × 105 | 10 (500 GHz) |
AlN54 | 2.12 | 2.3 × 10−19 | ∼1 | 9.3 × 105 | NA |
AlGaAs (this work) | 3.3 | 2.6 × 10−17 | ∼0.28 | 1.5 × 106 | 0.036 (1 THz) |
