We propose to use SiO2 gratings on the InP membrane on silicon (IMOS) platform to form ultra-weak grating-based antennas for generation of ultra-narrow free-space optical beams. Such long gratings can produce narrow beam widths of below 0.1°. By using selective dry etching, both the grating shape and the etch depth have been precisely controlled, yielding a highly robust fabrication process. Initial results have shown a 0.088° FWHM of the emitted beam in the far-field for a 1-mm antenna length.
|Title of host publication||Asia Communications and Photonics Conference, ACPC_2019|
|Publisher||Optical Society of America (OSA)|
|Publication status||Published - 2019|
|Event||Asia Communications and Photonics Conference, ACPC_2019 - Chengdu, Hong Kong|
Duration: 2 Nov 2019 → 5 Nov 2019
|Conference||Asia Communications and Photonics Conference, ACPC_2019|
|Period||2/11/19 → 5/11/19|