Two-dimensional photothermally induced grating

Abstract The phenomenon of photothermally induced transparency (PTIT) arises from the nonlinear behavior of an optical cavity, resulting from the heating of mirrors. By introducing a coupling field in the form of a standing wave, PTIT can be transitioned into photothermally induced grating (PTIG). A two-dimensional (2D) diffraction pattern is achieved through the adjustment of key parameters such as coupling strength and effective detuning. Notably, we observe first, second, and third-order intensity distributions, with the ability to transfer probe energy predominantly to the third order by fine-tuning the coupling strength. The intensity distribution is characterized by (± m , ± n ), where m , n = 1, 2, 3. This proposed 2D grating system offers a novel platform for manipulating PTIG, presenting unique possibilities for enhanced functionality and control.