[1] | Gauthier D 2005 Phys. World 18 30 |

[2] | Perez D, Gasulla I, Crudgington L, Thomson D J, Khokhar A Z, Li K, Cao W, Mashanovich G Z and Capmany J 2017 Nat. Commun. 8 636 |

[3] | Yu L J, Wang H Q, Li H, Wang Z, Huang Y D, You L X and Zhang W 2019 Chin. Phys. Lett. 36 084202 |

[4] | Cui X, Zhang C, Liang S, Zhu H L and Hou L P 2014 Chin. Phys. Lett. 31 044204 |

[5] | Zhao P C, Qi F, Qi A Y, Wang Y F and Zheng W H 2017 Chin. Phys. Lett. 34 024202 |

[6] | Ding Y X, Wang L L and Yu L 2018 Chin. Phys. Lett. 35 014201 |

[7] | Lin J T, Zhou J X, Wu R B, Wang M, Fang Z W, Chu W, Zhang J H, Qiao L L and Cheng Y 2019 Micromachines 10 612 |

[8] | Luo R, He Y, Liang H X, Li M X and Lin Q 2018 Optica 5 1006 |

[9] | Elkus B S, Abdelsalam K, Rao A, Velev V, Fathpour S, Kumar P and Kanter G S 2019 Opt. Express 27 38521 |

[10] | Geiss R, Saravi S, Sergeyev A, Diziain S, Setzpfandt F, Schrempel F, Grange R, Kley E B, Tunnermann A and Pertsch T 2015 Opt. Lett. 40 2715 |

[11] | Siew S Y, Cheung E J H, Liang H D, Bettiol A, Toyoda N, Alshehri B, Dogheche E and Danner A J 2018 Opt. Express 26 4421 |

[12] | Volk M F, Suntsov S, Ruter C E and Kip D 2016 Opt. Express 24 1386 |

[13] | Niu Y, Lin C, Liu X, Chen Y, Hu X, Zhang Y, Cai X, Gong Y X, Xie Z and Zhu S 2020 Appl. Phys. Lett. 116 101104 |

[14] | Zhang M, Wang C, Cheng R, Shams-Ansari A and Lončar M 2017 Optica 4 1536 |

[15] | Zhang J H, Fang Z W, Lin J T, Zhou J X, Wang M, Wu R B, Gao R H and Cheng Y 2019 Nanomaterials 9 1218 |

[16] | Fang Z W, Luo H P, Lin J T, Wang M, Zhang J H, Wu R B, Zhou J X, Chu W, Lu T and Cheng Y 2019 Opt. Lett. 44 5953 |

[17] | Lin J T, Yao N, Hao Z Z, Zhang J H, Mao W B, Wang M, Chu W, Wu R B, Fang Z W, Qiao L L, Fang W, Bo F and Cheng Y 2019 Phys. Rev. Lett. 122 173903 |

[18] | Hao Z Z, Wang J, Ma S Q, Mao W B, Bo F, Gao F, Zhang G Q and Xu J J 2017 Photon. Res. 5 623 |

[19] | Wang L, Wang C, Wang J, Bo F, Zhang M, Gong Q H, Loncar M and Xiao Y F 2018 Opt. Lett. 43 2917 |

[20] | He Y, Yang Q F, Ling J, Luo R, Liang H, Li M, Shen B, Wang H, Vahala K and Lin Q 2019 Optica 6 1138 |

[21] | Zheng Y, Fang Z, Liu S, Cheng Y and Chen X 2019 Phys. Rev. Lett. 122 253902 |

[22] | Wolf R, Jia Y, Bonaus S, Werner C S, Herr S J, Breunig I, Buse K and Zappe H 2018 Optica 5 872 |

[23] | Lu J, Surya J B, Liu X, Bruch A W, Gong Z, Xu Y and Tang H X 2019 Optica 6 1455 |

[24] | Lin J, Xu Y, Fang Z, Wang M, Song J, Wang N, Qiao L, Fang W and Cheng Y 2015 Sci. Rep. 5 8072 |

[25] | Wu R B, Lin J T, Wang M, Fang Z W, Chu W, Zhang J H, Zhou J X and Cheng Y 2019 Opt. Lett. 44 4698 |

[26] | Rao A, Patil A, Rabiei P, Honardoost A, Desalvo R, Paolella A and Fathpour S 2016 Opt. Lett. 41 5700 |

[27] | Jin M, Chen J Y, Sua Y M and Huang Y P 2019 Opt. Lett. 44 1265 |

[28] | Wang C, Zhang M, Chen X, Bertrand M, Shams-Ansari A, Chandrasekhar S, Winzer P and Lončar M 2018 Nature 562 101 |

[29] | He M, Xu M, Ren Y, Jian J, Ruan Z, Xu Y, Gao S, Sun S, Wen X, Zhou L, Liu L, Guo C, Chen H, Yu S, Liu L and Cai X 2019 Nat. Photon. 13 359 |

[30] | Liang H X, Luo R, He Y, Jiang H W and Lin Q 2017 Optica 4 1251 |

[31] | Diziain S, Geiss R, Zilk M, Schrempel F, Kley E B, Tunnermann A and Pertsch T 2013 Appl. Phys. Lett. 103 251101 |

[32] | Xu H, Dai D, Liu L and Shi Y 2020 Opt. Express 28 10899 |

[33] | Ding T, Zheng Y and Chen X 2019 J. Lightwave Technol. 37 1296 |

[34] | Wu R, Wang M, Xu J, Qi J, Chu W, Fang Z, Zhang J, Zhou J, Qiao L, Chai Z, Lin J and Cheng Y 2018 Nanomaterials 8 910 |

[35] | Wang M, Wu R, Lin J, Zhang J, Fang Z, Chai Z and Cheng Y 2019 Quantum Eng. 1 e9 |