Single nanobeam optical sensor with a high Q-factor and high sensitivity
Sejeong Kim, Hwi-Min Kim, Yong-Hee Lee
Optics Letters | OPTICAL SOC AMER | Published : 2015
The miniaturization of optical sensors is essential for the realization of compact, portable, and cost-effective devices. Photonic crystal-based optical sensors, which have an ultra-small mode volume and footprint, have demonstrated remarkable recent progress in achieving a high figure-of-merit (FOM) in a sensor. Here, we report an optical sensor with a high Q-factor and high sensitivity based on a photonic crystal nanobeam using the second lowest air band-edge mode. We calculated that a nanobeam (n=3.4) in a water environment (n=1.33) has refractive-index sensitivity of ~631 nm/RIU, while the quality factor is greater than 23,300. Accordingly, a theoretical FOM of the sensor corresponds to ..View full abstract
Awarded by National Research Foundation of Korea (NRF)
National Research Foundation of Korea (NRF) (NRF-2007-0093863, NRF-2014M3C1A3052567).