THZ spectroscopy system bypasses long-standing tradeoff between spectral and spatial resolution

Terahertz (THz) radiation, which occupies the frequency band between microwaves and infrared light, is essential in many next ...
Nature

Spectral Theory and Sturm-Liouville Equations

Spectral theory provides a rigorous framework for analysing the eigenvalues and eigenfunctions of differential operators that play an essential role in mathematical physics. In particular, ...