on chip mechanical exceptional points based on

on chip mechanical exceptional points
based on
In the field of photonics, exceptional points (EPs) are complex degeneracies in the eigenvalue spectrum of a physical system where two or more eigenstates coalesce. At these points, the eigenstates are coupled and their properties can undergo remarkable changes, leading to a variety of interesting physical phenomena. Recently, the concept of exceptional points has been extended to other physical systems, such as mechanical systems.
On-chip mechanical exceptional points refer to the exploration of exceptional points in micro- and nano-scale mechanical systems integrated on a chip. These systems typically involve vibrating structures, such as microcantilevers, microbeams, or phononic crystal membranes, where exceptional points can be engineered and observed.
The mechanical exceptional points are realized by exploiting the interaction between two or more resonant modes of the mechanical structure with tunable parameters, such as frequency, damping, or coupling strength. By carefully adjusting these parameters, the eigenfrequencies and eigenvectors of the system can be made to coincide, resulting in an exceptional point.
The unique properties associated with exceptional points make on-chip mechanical systems promising for various applications. For example, they can be used for ultra-sensitive sensing, where the changes in the spectral response
of the system at the EPs can be harnessed for highly precise measurements of various physical quantities, such as mass, force, or pressure.
Moreover, on-chip mechanical exceptional points enable
the development of non-reciprocal devices, where the transmission or reflection of mechanical waves can be controlled in a direction-dependent manner. This can be achieved by breaking the symmetry of the mechanical structure, introducing gain or loss, or utilizing the inherent
nonlinearity of the system.
Furthermore, the study of mechanical exceptional points can shed light on fundamental aspects of wave propagation, such as wave interference, wave-matter interactions, and energy transfer. By understanding the physics behind these exceptional points, researchers can further advance the field of phononics and pave the way for novel applications in information processing, signal manipulation, and quantum technologies.
In summary, on-chip mechanical exceptional points offer
a promising platform for exploring and harnessing the unique properties associated with exceptional points in mechanical systems. The ability to engineer and control these
exceptional points opens up new avenues for applications in sensing, non-reciprocity, and fundamental research in wave propagation.。