Reza explained the concept of nonlinear optics, which focuses on how materials respond to light in ways that cannot be explained through linear optics. These responses include various phenomena such as second-order nonlinear polarization and third-order nonlinear polarization, which play a crucial role in advancing optical technologies.

One of the main applications of nonlinear optics is in frequency conversion, which includes second harmonic generation, sum frequency generation, and parametric amplification. In addition, nonlinear optics is also utilized in quantum light generation, which includes entangled photon pairs and squeezed light generation, technologies that play a major role in the development of quantum computing and optical communications.

Furthermore, this lecture discusses intensity-dependent refraction phenomena, such as optical switching, self-phase modulation, and soliton generation, which enable precise manipulation of light in various optical applications. In addition, electro-optic effects are also a major topic, where changes in the electric field can be used to control the intensity and phase of light in devices such as electro-optic modulators and electro-optic sampling. In the quantum world, the phenomenon of spontaneous emission plays an important role, where the interaction between light and matter allows for electron transitions that cannot be explained in a classical perspective.

In terms of technology, this lecture also highlights the importance of optical resonators in improving the efficiency of nonlinear processes. In bulk systems, resonators usually take the form of Fabry-Perot resonators, while in chip systems, various types of resonators are used such as ring resonators, racetrack resonators, and disk resonators.

“One of the main materials used in this research is Lithium Niobate (LiNbO3), which undergoes various fabrication processes such as photolithography, electron beam lithography (EBL), gold deposition, etching, and mask removal. With this technology, nonlinear optics-based devices can be developed more efficiently in micro and nanoscale,” he said.

Through this guest lecture, students are expected to understand more about the potential of nonlinear optics in the development of optics, photonics, and quantum computing technologies. In addition, this event is also a platform for students to explore innovations in LiNbO3-based micro-resonator technology, which continues to grow in research and industry. With a better understanding of the interaction between light and matter, students are expected to contribute to the advancement of optics and photonics technology in the future.

Translator: Nabila Puspita (Bioengineering, 2022)