Mechanical resonators are devices that are designed to vibrate at specific frequencies, typically in the kilohertz to megahertz range. These resonators can be used in a variety of applications, including sensors, filters, and frequency references. Mechanical resonators can be fabricated from a variety of materials, including silicon, quartz, and aluminum nitride. They typically consist of a mass that is attached to a spring, which allows the resonator to vibrate at its natural frequency. Research in the field of mechanical resonators focuses on optimizing their performance, improving their sensitivity and stability, and developing new applications for these devices. This research often involves exploring new materials and fabrication techniques, as well as studying the fundamental physics of mechanical resonators.