講演情報
[21a-P01-6]Nonlinear Coherent Light-matter Interaction: Promising all-Optical Switching, Logic Gate and Optical Limiting Applications
〇(D)Sudhanshu Kumar Nayak1, Md Soif Ahmed1, Chinmay Barman1, Rahul Murali1, Bota Bhavani2, Seelam Prasanthkumar2, Lingamallu Giribabu2, Sai Santosh Kumar Raavi1 (1.Ultrafast Photophysics and Photonics Laboratory, Department of Physics, Indian Institute of Technology Hyderabad, Kandi 502285, Telangana, India, 2.Polymers & Functional Materials Division, CSIR-Indian Institute of Chemical Technology, Tarnaka, Hyderabad-500007, India)
キーワード：
Nonlinear Optics、Spatial self-phase modulation (SSPM)、All-optical switching Logic gates
Spatial self-phase modulation (SSPM) is a nonlinear optical (NLO) coherent interaction between light and matter. The phase gets self-modulated due to the change of the nonlinear refractive index through the nonlinear Kerr effect and produces diffraction rings at the far fields. Porphyrins are organic molecules with π-conjugation electron-rich systems, which is a profit for higher NLO response. These molecules have various applications in photonics, optoelectronics, etc. Herein, we report the NLO properties of four metalated porphyrin-napthalimide based molecules named as PN-Zn, PN-Ni, PN-Cu, and PN-Fb using SSPM and continuous wave (CW) Z-scan method for exploring various optoelectronic applications. We have performed SSPM of four samples using three different lasers of wavelengths λ=433 nm, 532 nm, and 636 nm. We have observed the number of diffraction rings (N) increases linearly with increase in intensity (I) of laser. This is because, the particles get polarized and oriented along the direction of the electric field of incident light which increased with intensity of light through SSPM effect. From slope dN/dI (N vs I graph), we have calculated the nonlinear refractive index and nonlinear susceptibility in order of 10-5cm2/W and 10-3 esu, respectively. The OR logic gate demonstration in PN-Zn has been performed by cross self-phase modulation (XSPM) using 532 nm, and 636 nm laser, and the output satisfied with OR-Logic gate conditions. The higher intensity of one laser will induce the SSPM effect in low-intensity laser by changing the nonlinear phase. From open-aperture and closed-aperture Z-scan these molecules showed reverse saturable absorption with values of two-photon absorption coefficients in order of 10-3 cm/W and positive nonlinear refractive index. From optical limiting studies and SSPM, these molecules can be suitable for all-optical switching, OR-Logic gate, optical limiting optoelectronics applications.