1K Optics-combined scanning tunneling microscope

By integrating scanning tunneling microscope (STM) with optical spectroscopy, we can precisely examine the electronic, vibrational, and photonic characteristics of materials at the atomic scale. We present the construction of the home-built optics combined STM that operates at low temperatures (1 K) in an ultra-high vacuum (UHV) environment. This system utilizes an optical fiber to apply light and incorporates a unique alignment technique for the optical setup. A home-built Joule-Thomson cooling system is used to achieve at 1 K. We verified the optics alignment by observing electroluminescence in Ag(111) using the etched Au tip. The system is also designed for future upgrades, such as integrating magnetic field capabilities and electron spin resonance (ESR) functionalities, further expanding its experimental potential.