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

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.

Back to article page