Hyosim Yang, Gangseon Ji, Min Choi, Seondo Park, Hyeonjun An, Hyoung-Taek Lee, Joonwoo Jeong, Yun Daniel Park, Kyungwan Kim, Noejung Park, Jeeyoon Jeong, Dai-Sik Kim, Hyeong-Ryeol Park
Nanoconfined waters exhibit low static permittivity mainly due to interfacial effects that span about one nanometer. The characteristic length scale may be much longer in the terahertz (THz) regime where long-range collective dynamics occur; however, the THz dynamics have been largely unexplored because of the lack of a robust platform. Here, we use metallic loop nanogaps to sharply enhance light-matter interactions and precisely measure real and imaginary THz refractive indices of nanoconfined water at gap widths ranging from 2 to 20 nanometers, spanning mostly interfacial waters all the way to quasi-bulk waters...
April 26, 2024: Science Advances