Fig. 1. Manufacturing method and characteristics of LIG. (a) Schematic of manufacturing LIG; (b) image of LIG; (c) Raman spectrum of LIG; (d) transmission spectrum of LIG; (e) SEM image of LIG (scale is 20 μm); (f) micrograph of a microsphere fixed on LIG (scale is 100 μm)

Fig. 2. Schematic of the experiment setup for the all-optical control

Fig. 3. Characteristics of microsphere with LIG and its tunability. (a) Transmission spectrum in the range of 1558 from 1563 nm; (b) transmission spectrum of a single resonance mode; (c) mode redshift with increasing pump power; (d) wavelength shift with pump power; (e) Q factor with pump power

Fig. 4. All-optical modulation of the reflection spectra. (a) Transmission and reflection spectra in the range of 1559.7 to 1560.1 nm; (b) enlarged transmission and reflection spectra; (c) redshift of the reflection spectra with increasing pump power; (d) wavelength shift of the reflection spectra with pump power

Fig. 5. Measure optical response. (a) Synchronization signal of the 980 nm pump light; (b) all-optical tuning of the response signal

Table 1. Performance of different all-optical tuning schemes