Journal of Physical Chemistry & Biophysics
Open Access
ISSN: 2161-0398
ISSN: 2161-0398
Xuechang Ren, Canhui Wang and Jiazhou Liu
Posters-Accepted Abstracts: J Phys Chem Biophys
The design and experimental fabrication of grating based dual-band demultiplexers (GDDs) are presented. The theoretical design is provided for choosing appropriate grating period and light incident angle, which are vital parameters for successful performance of a GDD. The GDDs fabricated according to the method, enable the two signals to be completely separated and propagate in the substrate as guided waves along opposite directions. To verify the method, a holographic GDD was fabricated to separate 458- and 633-nm laser beams. The experimental result demonstrates the proposed method has high applicability. An optical spectrum analyzer (OSA) was used to measure the spectral characteristics of the GDD. The insertion loss for 458 nm-channel is less than 7.6 dB, and that for 633 nm-channel is no more than 12dB. Considering that the grating fabricated in the experiment has low diffraction efficiency, the insertion loss can be further reduced by fabricating GDDs with higher diffraction efficiency. In conclusion, we have proposed a method to design GDDs to separate the two wavelengths from an incident light. The two separated signals propagate in the substrate as guided waves along opposite directions. Using the theoretical design, the grating period and the light incident angle can be worked out for known wavelengths and substrate so that GDDs for specific applications can be readily made and applied. In consideration of the insertion loss of GDDs, high diffraction efficiency and small light incident angle are favorable. The method enables fast design and fabrication of dual-band demultiplexers, thus has the potential for wide applications.
Xuechang Ren has completed her PhD at the age of 26 years from Xiamen University Department of Physics. She is the Associate Professor of Xiamen University in China. She has done major in holography and its application. She has published more than 20 papers in reputed journals.