Abstract
In this letter, design and development of a square knot resonator (SKR) for sensing applications is proposed. The SKR is developed by carefully weaving a single-ended microfiber in and out of a double-ended microfiber. The dependence of the SKR’s resonance wavelength on the circular path length and the effective index of microfiber is utilized to sense the bending. Two 4.5-cm-long and 16- $\mu \text{m}$ -diameter tapered microfibers are used to construct an SKR having a diameter of $885~\mu \text{m}$ which has a free spectral range of 0.505 nm, and the $Q$ -factor is more than 14 500. Experimental results show that the bending sensitivity of the SKR is 3.04 nm/m−1 with a maximum theoretical resolution of $3.29 \times 10^{-3} \text {m}^{-1}$ . The temperature sensitivity of the SKR is 3.2 pm/°C.
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