Fig. 3: Illustration of collimation behavior of the ML. | Nature Communications

Fig. 3: Illustration of collimation behavior of the ML.

From: Sub-wavelength lateral detection of tissue-approximating masses using an ultrasonic metamaterial lens

Fig. 3: Illustration of collimation behavior of the ML.The alternative text for this image may have been generated using AI.

Collimation-like spatial sound field of ML at 576 kHz (a) and lateral beam width of the emitting transducer compared to the lens in a gelatin tissue phantom (b). The tissue phantom does not cause beam divergence and the beam remains collected along the optical axis. Whereas FWHM of the beam varies by 36% for the transducer, it only varies 4.5% for the length of the beam for the ML (c).

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