Numerical and experimental analysis of long period gratings in wavelength scale elliptical microfibers

Jin Wa^{1, 2, †}, Bi Wei-Hong^{1, 2}, Fu Guang-Wei^{1, 2}

(color online) (a) Measured transmission spectra when the LPG is immersed into oil with refractive index of 1.3. (b) Resonance wavelength of slow mode as a function of temperature.