Presentation Information
[23p-12H-8]Time-resolved electric field-induced second harmonic generation spectroscopy: Optoelectronic setup for polarization reversal in ferroelectric material
〇(PC)Siddhant Anandrao Dhongade1, Akihito Sawa1, Hiroyuki Yamada1, Hiroyuki Matsuzaki1 (1.National Institute of Advanced Industrial Science and Technology (AIST))
Keywords:
Second harmonic generation spectroscopy,Time resolves electric field induce second harmonic generation spectroscopy,Ferroelectric thin films
The exploration of materials with spontaneous electric polarization, crucial in various technological fields, has long fascinated scientists. Time-resolved electric-field-induced second harmonic generation (TR-EFISHG) stands out as a pivotal technique in this area, offering high precision in studying the dynamic aspects of ferroelectrics. This method, blending second harmonic generation principles with real-time monitoring of ferroelectric polarization, leverages ultrafast laser and short electric pulses to investigate transient behaviors in ferroelectrics. In conventional electric methods, the measurement of polarization reversal in ferroelectrics is often destructive. However, using the optical approach of SHG, we can measure polarization states non-destructively. Our study focuses on developing an optoelectronic setup to understand ferroelectric polarization reversal in various devices such as ferroelectric HfO2-based devices, ferroelectric perovskite devices, and so on.
For this setup, we utilized a Ti: sapphire femtosecond regenerative amplifier with an 800 nm wavelength. This laser operates at a 1 kHz frequency, emitting 100 fs pulses with ~3 mJ energy. It works in sync with a function generator which allows the short voltage pulse injection in the devices, triggered by a digital delay generator at 500 Hz to drive the short voltage pulse in a desirable direction. We synchronized the digital delay generator and the laser at 1 kHz using a pulse picker by converting a 78 MHz which was obtained from the Ti: sapphire femtosecond oscillator. The attached figure illustrates our experimental setup for TR-EFISHG having a temporal resolution of ~ 1.4 ns up to 12 V and a delay step precision of less than ~100 ps which allows us to measure the polarization reversal in ferroelectric materials and devices.
For this setup, we utilized a Ti: sapphire femtosecond regenerative amplifier with an 800 nm wavelength. This laser operates at a 1 kHz frequency, emitting 100 fs pulses with ~3 mJ energy. It works in sync with a function generator which allows the short voltage pulse injection in the devices, triggered by a digital delay generator at 500 Hz to drive the short voltage pulse in a desirable direction. We synchronized the digital delay generator and the laser at 1 kHz using a pulse picker by converting a 78 MHz which was obtained from the Ti: sapphire femtosecond oscillator. The attached figure illustrates our experimental setup for TR-EFISHG having a temporal resolution of ~ 1.4 ns up to 12 V and a delay step precision of less than ~100 ps which allows us to measure the polarization reversal in ferroelectric materials and devices.