Optical fiber sensor based on the short-range surface plasmon polariton mode简

The dispersion compensation properties of dual-concentric core photonic crystal fibers are theoretically investigated in this letter. The effects of geometric structure on the dispersion properties of dual-concentric core photonic crystal fibers are carefully studied by finite element method. The first layer of holes around the core area is enlarged in a new manner with the near-core point fixed. Considering the tradeoff among several parameters, results show that the dispersion compensation wavelength and strength can be tuned to desired values by constructing an appropriate design of the geometric structure of photonic crystal fibers.     

Phase imaging with rotating illumination简

In holographic encryption, double random-phase encoding in the Fresnel domain （DRPEiFD） is a preva- lent encryption method because it is lensless and secure. However, noises bring adverse effects during decryption. In this letter, we introduce quick-response （QR） coding during encryption to resist noises. We transform the original information into a QR code and then enerypt the code as a hologram through DRPEiFD. To retrieve the input, we deerypt the hologram in the opposite manner to the encryption and subsequently obtain a QR code with noises. By scanning this code with proper applications in smart- phones, we can obtain a noise-free retrieval. Numerical experiments and images scanned by a smartphone are shown to validate our proposed method.