Fig. 1: Metamaterial lens with sound field at collimation and non-collimation frequencies. | Nature Communications

Fig. 1: Metamaterial lens with sound field at collimation and non-collimation frequencies.

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

Fig. 1: Metamaterial lens with sound field at collimation and non-collimation frequencies.The alternative text for this image may have been generated using AI.

Experimentally measured spatial sound field of metamaterial lens at 527 kHz demonstrating beam divergence (a) and 576 kHz demonstrating collimation (b). c Image of 2D phononic crystal metamaterial lens used for examining enhanced lateral resolution with the setup for the emitter. d The collimation frequency occurs above the first complete gap where \(\frac{{\mathrm{d}k}}{{\mathrm{d}{\mathrm{{\Omega}}}}}\) is highly variable and non-positive for some wavevectors, indicative of metamaterial features.

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