Platinum diselenide (PtSe₂), an emerging two-dimensional transition metal dichalcogenide, exhibits thickness-dependent refractive index, and hence, intriguing optical properties. Here, we employ it as a plasmonic sensing substrate to achieve significant enhancement in Goos-Hänchen shift sensitivity. Through systematic optimization of all parameters, four optimum sensing configurations have been achieved at different wavelengths ranging from visible to near-infrared region, where the Goos-Hänchen shift sensitivity receives four times enhancement in comparison with the conventional bare gold sensing substrate. There is a linear range of Goos-Hänchen shift with the tiny change of refractive index for each optimal configuration. The detection limit of the refractive index change can be as low as 5 × 10⁻⁷ RIU which is estimated to be lower by 2 orders of magnitude, and the corresponding sensitivity of biomolecules has a 1000-fold increment compared with that of bare gold-based sensors.

二硒化铂（PtSe ₂），一种新兴的二维过渡金属二卤化硅，具有取决于厚度的折射率，因此具有吸引人的光学性能。在这里，我们将其用作等离子体传感基板，以实现Goos-Hänchen位移灵敏度的显着提高。通过所有参数的系统优化，在从可见光到近红外区域的不同波长下，已经实现了四种最佳感测配置，与传统的裸金感测基板相比，Goos-Hänchen位移灵敏度提高了四倍。对于每种最佳配置，Goos-Hänchen位移都有一个线性范围，且折射率的微小变化。折射率变化的检测极限可低至5×10^-7 RIU估计低2个数量级，与裸金基传感器相比，相应的生物分子灵敏度具有1000倍的增量。