FIG. 5.
A snapshot of the acoustic wave, a plane wave pulse after passing through the negative lens. The negative lens boundary is marked by the white dashed line. x is parallel to the flat transducer surface, whereas z is along the transducer axis.
Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.