Abstract
We observe the dropping of electromagnetic waves having a specific frequency or a certain frequency band in two-dimensional dielectric photonic crystals. The single frequency is dropped via cavity waveguide coupling. Tunability of the demultiplexing mode can be achieved by modifying the cavity properties. The band-dropping phenomenon is achieved by introducing interaction between an input planar, or coupled-cavity, waveguide and the output coupled-cavity waveguides (CCWs). The dropping band can be tuned by changing the coupling strength between the localized cavity modes of the output CCWs. We also calculate the transmission spectra and the field patterns by using the finite-difference-time-domain (FDTD)method. Calculated results agree well with the microwave measurements.
Highlights
In which the propagation of electromagnetic waves is forbidden for a certain frequency range, provide a promising tool to control the flow of light in integrated optical devices [1, 2]
We propose and demonstrate the band-demultiplexing phenomenon in 2D photonic crystals
The second configuration is obtained by replacing the planar waveguide (PW) with a coupled-cavity waveguides (CCWs) which is constructed by an array of coupled cavities with two missing rods [See Fig. 5]
Summary
In which the propagation of electromagnetic waves is forbidden for a certain frequency range, provide a promising tool to control the flow of light in integrated optical devices [1, 2]. Photonic band gap structures can be used to construct the optical add-drop filters which can be effectively used in wavelength-division-multiplexing (WDM) applications. The first photonic crystal based WDM structure was proposed by Fan et al by using resonant tunneling phenomena between two line-defect waveguides via cavities [14]. Kosaka et al reported WDM filters by using superprism phenomena [11] Noda and his co-workers proposed and experimentally demonstrated trapping and dropping of photons via cavity-waveguide coupling in 2D photonic crystal slabs [15]. The single frequency dropping is achieved via coupling between resonant cavities and a waveguide [See Fig. 1(a)]. Photons having a certain frequency band inside the input waveguide can be filtered through the output coupled-cavity waveguides. In FDTD simulations, we normalize the transmission spectra with respect to the source spectra
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