The measured spatial mappings of phase contrast image at 11.28GHz (i.e. relative frequency of 0.376a/λ) with (a) θ inc =10° and (b) θ inc =30°, where the white lines distinguish the adjacent integrated phasefront into the main red area and blue area with different spatial periods.  

Contexts in source publication

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... are conducted to prove the previously mentioned effects of zero phase delay in PhC by modulating the wavefront of transmitted EMW. Fig. 5 shows the measured electric fields of phase image with the different incident angles of (a) θ inc =10° and (b) θ inc =30°. In Fig.5(a) the source wave of 11.28GHz (i.e. relative frequency of 0.376a/λ) is incident upon the PhC slab with the incident angle of θ inc =10°, the phase internal field of this PhC sample are measured and allow ...

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... 5 shows the measured electric fields of phase image with the different incident angles of (a) θ inc =10° and (b) θ inc =30°. In Fig.5(a) the source wave of 11.28GHz (i.e. ...

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... angles of (a) θ inc =10° and (b) θ inc =30°. In Fig.5(a) the source wave of 11.28GHz (i.e. relative frequency of 0.376a/λ) is incident upon the PhC slab with the incident angle of θ inc =10°, the phase internal field of this PhC sample are measured and allow us to form an image that can be compared directly with the numerical simulations. In Fig. 5(a), the negative phase described with the blue area (1) in the PhC slab connects the incident wave and the transmitted wave with the same phase, and the positive phase front is denoted by the red area (2), with the phase contrast mode sliding perpendicular to the energy flow. The phase fronts are seen to be considerably coherent with the ...

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... zero just like one continue wave without spatial separation. Further experimental study find that phase distribution of the internal EM field present a dramatic dependence on the incident angle. When the same source wave of 11.28 GHz is incident at a big incident angle of 30°, the measured electric fields (real part and phase) are demonstrated in Fig. 5 (b) with a smaller spatial period than the former. In both cases, the combined effects of wavefront (or phasefront) modulation in the PhC sample agree well with the simulation results, which demonstrate that the method of wavefront modulation is an efficient method to realize zero phase delay of EMW propagation. In contrast to the ...