Study On The Principle And Application Of Several Photonic Devices

Energy transfer between continuous channels is very important to wavelength division multiplexed (WDM) and integral circuit. It can be used in some fields, such as optical communication. Channel dropping filters, which allow a signal from one channel to access another channel of WDM, and do not disturb signals in that channel, are useful elements for WDM. We design several combined photonic crystals models based on the destructive interference theory, which can transfer completely the energy of a signal from one channel to another, or can realize light switching. The multiply scattering method is used to simulate the propagation of waves in these structures. On the other hand, we also manufacture the samples and measure the transmittance of light with Hp8510C vector network analyzer. The result of experimental measurement is in good accordance with that of theoretical calculation. This indicates that both energy transfer and light switching could be realized. Our energy transfer model could be used to design photonic devices, such as channel dropping filters and light switches. The light switches have the characteristics of fast response and could be used in the system requiring fast response. Furthermore, we also demonstrate theoretically and experimentally that the surface state in photonic crystals exists indeed.