Abstract
Thermal sensing with fine spatial resolution is important to the study of many scientific areas. While modern microscopy systems allow optical detection at high spatial resolution, their intrinsic functions are mainly focused on imaging but limited in detecting other physical parameters, for example, mapping thermal variations. Here, with a coating of an optical exceptional point structure, we demonstrate a low-cost but efficient multifunctional microscope slide, supporting real-time monitoring and mapping of temperature distribution and heat transport in addition to conventional microscopic imaging. The square-root dependency associated with an exceptional point leads to enhanced thermal sensitivity for precise temperature measurement. With a microscale resolution, real-time thermal mapping is conducted, showing dynamic temperature variation in a spatially defined area. Our strategy of integrating low-cost and efficient optical sensing technologies on a conventional glass slide enables simultaneous detection of multiple environmental parameters, producing improved experimental control at the microscale in various scientific disciplines.
Highlights
Thermal sensing with fine spatial resolution is important to the study of many scientific areas
Through the reflection measurements at the initial exceptional points (EPs) wavelength, the temperature distribution on the glass slide can be gauged with high spatial resolution, facilitating efficient thermography in addition to conventional topographic imaging in an intact microscope system
In summary, utilizing the enhanced sensitivity arising from an optical EP, we have demonstrated a novel thermo-sensitive glass slide facilitating simultaneous microscopic mapping and monitoring of temperature distribution and thermal variation
Summary
Thermal sensing with fine spatial resolution is important to the study of many scientific areas. With a coating of an optical exceptional point structure, we demonstrate a low-cost but efficient multifunctional microscope slide, supporting real-time monitoring and mapping of temperature distribution and heat transport in addition to conventional microscopic imaging. Without modifying the microscope system, we demonstrate a low-cost thermo-sensitive microscope slide for highly distributed temperature mapping and real-time monitoring of heat transport. By utilizing the enhanced sensitivity intrinsically associated with the topology of non-Hermitian EPs, a multilayer EP structure is designed and coated on a conventional microscope slide to sense temperature variations. Through the reflection measurements at the initial EP wavelength, the temperature distribution on the glass slide can be gauged with high spatial resolution, facilitating efficient thermography in addition to conventional topographic imaging in an intact microscope system
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