Abstract: We fabricated and theoretically investigated an add–drop filter (ADF) using an on-chip whispering gallery mode (WGM) microtoroid resonator with ultrahigh-quality factor $(Q)$ side coupled to ...

Add Yahoo as a preferred source to see more of our stories on Google. Nicola Cottington said improvements had been made but more work was needed [Jamie Niblock/BBC] A hospital boss said falling ...