One laser diode, 2 aperture, 3 polarization beam splitter, 4 quarter-wave
plate, 5 quadrant photo-detector (QPD), 6 dual-axis manual stage, 7 CCD camera, 8 tube lens, 9 LED illuminator, 10 beam splitter, 11 pellicle beam splitter, 12 objective lens, 13 three-axis manual stage, 14 single-axis piezoelectric scanner (Z-PS), 15 probe holder, 16 cantilever probe, 17 sample, 18 single-axis piezoelectric scanner (Y-PS), and 19 three-axis piezoelectric scanner (XYZ-PS).
Capasso, "A broadband, background-free quarter-wave
plate based on plasmonic metasurfaces," Nano Letters, vol.
It should be noted that a necessary condition for achieving high transmission efficiency is that the quarter-wave
plate must be symmetric, thus requiring the outer sheets to be identical .
Capasso, "A broadband, backgroundfree quarter-wave
plate based on plasmonic metasurfaces," Nano Lett., Vol.
Caption: FIGURE 5: Schema of experimental setup for generated POVs: spatial filter and collimator; TLC-SLM: transmission liquid crystal spatial light modulator; P1: polarizer; QWP1: quarter-wave
plate 1; P2: analyzer; QWP2: quarter-wave
plate 2; P: pupil; L: Fourier lens with f = 380 [mm] and CCD camera.
In this case, the transducer structure may be represented as a short-circuited quarter-wave
"Bandwidth Enhancement Technique for Quarter-Wave
Patch Antennas",IEEE Antennas and wireless propagation letters, 2: 130-132.
, a polarizing system with the properties of a quarter-wave
plate, with an additional optical activity based on two birefringent plates of arbitrary thickness, is considered theoretically and implemented experimentally.
The ROM was resized by applying the quarter-wave
symmetry technique in one quarter of the sine wave, and an angular decomposition technique based on trigonometric identity has been applied to compress the quarter ROM LUT.
Lee, "Enhancement of bandwidth in a chirped quarter-wave
dielectric mirror," Journal of Electromagnetic Waves and Applications, Vol.
The PIFA reported in  used parasitic patches, slots and quarter-wave
resonators to realize the tri-band operation within a volume of 40 x 20 x 8 [mm.sup.3].
, and featured one sample sandwiched between two quarter-wave