Underwater ultrasonic topological waveguides by metal additive manufacturing. - Wang, Michael Y.; Thevamaran, Mythili; Mattei, Michael Sabatini; Hacha, Brandon G.; Mazzei Capote, Gerardo Andres; Yu, Zongfu; Osswald, Tim; Goldsmith, Randall H.; Thoma, Dan J.; Ma, Chu (Applied Physics Letters, 2022)