Abstract

Whispering Gallery Modes (WGMs) resonator based biosensors have received much attention due to the advantages of small volume, high sensitivity and label-free. Such sensors can be assigned into passive resonator sensor [1] and active resonator sensor. Different with passive resonator sensor, active resonator based sensor [2] is potential because there are (i) no need an expensive tuneable laser as source; (ii) no need a waveguide or a tapered fiber to couple evanescent field; (iii) no need a nanopositioner for adjusting coupling distance. However, as one of active resonator’s drawbacks, the limited lifetime of lasing determined by organic dye should be considered. In order to solve this problem, many researchers use renewable gain material to reproduce active resonators. Such renewable devices usually based on a liquid system. For solid-state sensing system, another scheme is to use a disposable resonator. To achieve such a resonator, a low-cost, on-demand, rapid fabrication method is required. Based on this consideration, we demonstrated a printable active microdisk resonator for protein adsorption sensing by using ink-jet printing fabrication method [3].

© 2017 IEEE