We propose and experimentally demonstrate a high-order coupled-resonator optical waveguide (CROW) nanobeam filter with semi-symmetrical Fano resonance enhancement. Thanks to the tight arrangement of multiple nanobeams and assistance of the partial transmission element, the designed filter has a high-contrast transmission and low insertion loss. Finally, the fabricated filter has a compact size of 20 µm × 10 µm, a high extinction ratio as much as 70 dB, and an insertion loss as low as 1 dB. This filter shows a passive structure without thermal control configuration for calibration on each resonator. This compact filter can be a basic building block for various applications requiring high extinction ratio filtering, such as single-photon source filtering of integrated photon chips.
Bibliographical noteFunding Information:
Funding. National Natural Science Foundation of China (61805090, 62075075); The Center of Excellence, Denmark SPOC (DNRF123); VILLUM FONDEN, QUANPIC (00025298).
© 2021 Optical Society of America