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Hole array transmittance as a function of wavelength for vertically polarized light with tilt angles (blue square dots) and 6° (red round dots). The inset is an illustration of tilt direction.
Experimental setup to observe the interference pattern of SPPs for wavelength light. The collinear polarization MZ interferometer is composed of two PBSs, two HWPs, and a BC. The BC is tilted to generate a phase difference between the horizontal and vertical polarization modes. The metal plate is set between two lenses with the focus of and the second PBS is removed in some cases.
Interference pattern for light with wavelength. (a) The second PBS is placed in the experimental setup. The black square dots are normalized counts without the metal plate, while the red round dots are those with the metal plate. They both fit the theoretical calculation (the line) well, which sustains the conclusion that the phase of the illuminating light can be transferred to the SPPs. (b) The counts are kept constant when we take the second PBS out and the metal plate away. (c) An interference pattern is observed when the metal plate is placed between the two lenses at the tilted angle of 6° even without the second PBS. The interference of SPPs can be fully controlled by the phase difference .
Experimental setup to observe the interference pattern of SPPs for wavelength light. The path difference of the MZ interferometer gives the phase difference . A R is displaced slightly to observe the interference pattern of bright and dark stripes.
Energy distribution recorded by the CCD. (a) General interference pattern of a displaced MZ interferometer with the second PBS. (b) Energy distribution when the second PBS is removed. The metal plate is moved out for (a) and (b). (c) Interference pattern of SPPs is observed even when the second PBS is removed. The metal plate is tilted 6° to excite SPPs.
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