As a traditional mineral medicine, Lapis Chloriti has attracted much attentions in recent years. Based on the components determined by the X-ray diffraction, the Lapis Chloriti were characterized by the terahertz time domain spectroscopy. Results show that the absorption of sample has positive correlation with concentration. The more mass with Lapis Chloriti, the more absorption. And the absorption becomes more intense with the particle size increasing. In addition, the absorption influenced by other factors are also compared and discussed.
A guided-mode resonance(GMR) filter which can work at multiple tunable frequencies is designed and obtained by using a readily available photonic crystal. The photonic crystal consists of several layers of dielectric rods with different radii in each layer. When light is incident upon this photonic crystal at a small incident angle, guided mode resonance in each rod layer will be excited. At the resonant frequencies, nearly 100% narrow reflection peaks with zero reflection sidebands, an excellent GRM filter, can be obtained. In addition, the resonant frequency of each layer is closely related to the radius of the rod and all the resonances of the whole structure almost don't interact with each other. Therefore, by adjusting the radii of the rods in each layer, the operating frequencies of the filter can be freely tuned both individually and simultaneously, a perfect tunable multichannel GMR photonic crystal filter is obtained. This optical device has apparent advantages, simple structure, small and compact size, easy fabrication and integration. Therefore, it has great application potential in modern optical network.
The characteristics of Calamines has been firstly analyzed by terahertz time-domain spectroscopy. Results show that the main composition of the Calamine is calcite. And the terahertz absorption much relates with the particle size, sample thickness, as well as the proportion of polytetrafluorethylene mixed in the sample.
The absorption coefficient and refractive index of the tourmaline in different directions have been firstly characterized by the terahertz time-domain spectroscopy. Results show that the absorption and refractive index of terahertz are much related with the tourmaline structure. And the absorption along the optical axis direction is more sensitive than that of the vertical direction. Such a result indicates that the identification and characterization of crystals as well as minerals can be realized by the THz method.
Proc. SPIE. 9142, Selected Papers from Conferences of the Photoelectronic Technology Committee of the Chinese Society of Astronautics: Optical Imaging, Remote Sensing, and Laser-Matter Interaction 2013
The quantum holography scenario with classical thermal light source based on the second-order correlation measurement is proposed. Contrastive analysis prove that the quantum holography can be carried out with classical thermal light source and entangled two-photon light source. For the second-order correlation measurement in quantum holography, the “unbalanced test system” condition must be satisfied.
The interaction between polymer of Delrin with nano-second pulse laser is investigated in laser plasma micro-propulsion.
The coupling coefficient and specific impulse are measured respectively. The coupling coefficient about 42 dyne/W and
specific impulse up to 646 s have been obtained. Moreover, the surface images after ablation have been observed. It is
found that Delrin has less debris on ablation surface. This indicates that Delrin is a potential polymer material in laser