Silica microspheres self-assembled on the outer surface of a standard single-mode silica optical fiber are investigated.
The three dimensional colloidal crystals of FCC structure coating on the cylindrical substrate are fabricated through
isothermal heating evaporation induced self-assembly. The resulting photonic crystal cylindrical annulus is characterized
by scanning electron microscopy (SEM). The SEM images illustrate the  and -oriented regions, besides the
two zones regularly intercrossed pattern. Qualitative analysis and discussion are carried out for the arrangement of
various oriented regions.
We report the experimental demonstration of colloidal crystal deposited on the end face of fiber, as well as the side
cladding. The colloidal photonic crystals were fabricated through isothermal heating evaporation-induced self-assembly.
The resulted samples were characterized structurally by scanning electronic microscope (SEM) and optically by
transmission spectra analyzer. A moderately transmission dip at 1543 nm and 1546 nm wavelength coincides with the
photonic band gap expected for the 710 nm silica microspheres.
The modulation and demodulation technique of laser self-mixing interference vibrometer is researched in this paper.
Combining with triangular current modulation and DSP demodulation technique, a new-type laser self-mixing
interference vibrometer is designed to achieve non-contact vibration measurement of a target. Theoretical analysis,
simulation results and error evaluation are presented in this paper. The vibration waveform is reconstructed with an
accuracy of 0.325 micron in a wide dynamic range. Experiments results show a good agreement with the simulative
results. The vibrometer is compact, inexpensive, self-aligning and can be applied to various vibration measurements for