Recently, the Biophotonic Optical Chip Laboratory at the School of Physics has made significant progress in the research of integrated photonic devices. The related achievements have been published in the internationally renowned physics journal Optics Letters with the title "Mid-infrared giant optical chirality induced by multipole degeneracy in a diamond metasurface". The first author of the paper is Wang hao, a master's student majoring in electronic information from the School of Physics, with Professor Xiao Tinghui as the corresponding author. The School of Physics at Zhengzhou University is the first unit of the paper.

Optical chirality is a fundamental property of light that plays a crucial role in chiroptical spectroscopy, analytical chemistry, spin photonics, and astrobiology. However, giant optical chirality at the wavelength beyond 15 µm remains untapped, which hinders its various applications, such as ultrasensitive vibrational circular dichroism, in the midinfrared region.

Here we propose and theoretically present giant optical chirality with a, to our knowledge, recordhigh value of ∼330 at the wavelength beyond 15 µm in a diamond metasurface. This is enabled by tailoring the multipole degeneracy and leveraging the low optical loss of the diamond metasurface. This work provides a new method for boosting the optical chirality at the wavelength beyond15 µm.

Figure 1:The diamond metasurface is composed of air-hole-structured diamond

Article link: https://doi.org/10.1364/OL.550219