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Results: 3

1.
Figure 3

Figure 3. From: Ultrasonically encoded wavefront shaping for focusing into random media.

Visualization of the optimized focal spot when uniform, randomized, and optimized phase patterns (a–c) were displayed.The captured CCD images of the fluorescent bar are given in (d–f). The color bars indicate the phase for (a–c) and the CCD intensity for (d–f). (g) The cross sectional intensity, as indicated by the white dotted lines in (d–f). An increase of an order of magnitude is seen using the optimized pattern, compared to both uniform and randomized patterns.

Jian Wei Tay, et al. Sci Rep. 2014;4:3918.
2.
Figure 2

Figure 2. From: Ultrasonically encoded wavefront shaping for focusing into random media.

(a) Improvement over the initial signal amplitude as the algorithm progresses. An improvement of 11 times in signal amplitude was obtained, which corresponds to a similar increase in light intensity within the acoustic focal zone. An order of magnitude improvement was achieved at 370 iterations, as indicated by the dotted line. (b) Measured ultrasonically encoded signal amplitude with the optimized pattern (red, solid line), and with an initial, randomized pattern (blue, dashed line) displayed on the SLM. The traces were averaged over 75 acquisitions.

Jian Wei Tay, et al. Sci Rep. 2014;4:3918.
3.
Figure 1

Figure 1. Experimental setup.. From: Ultrasonically encoded wavefront shaping for focusing into random media.

The incident beam on the first diffuser (D1), initially planar, is spatially tailored using a phase-only spatial light modulator (SLM). Five cycles from a focused 6 MHz ultrasonic transducer (UST) are sent through a clear gelatin medium (CM), modulating light within the acoustic focus. After the second diffuser (D2), the modulated beam is collected using an optical fiber bundle (OFB). The signal is measured using a photorefractive detection (PRC) system and a photodiode (PD), and its amplitude is subsequently used as feedback to optimize the pattern on the SLM. To visualize the focal spot, a bar of fluorescent quantum dots (QD) is embedded along the y-axis of the acoustic focal zone. The resulting fluorescence intensity is longpass filtered (LPF) and measured using a CCD camera.

Jian Wei Tay, et al. Sci Rep. 2014;4:3918.

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