[25a-D316-1~10] 3.6 Ultrashort-pulse and high-intensity lasers

△ [25a-D316-4] Optical-field measurement device using metal-insulator hybrid structures

〇Ko Arai¹, Daiki Okazaki¹, Ikki Morichika¹, Satoshi Ashihara¹ (1.IIS, The Univ. of Tokyo)

Keywords:optical-field measurement, tunneling electron emission, plasmonics

With the remarkable development of attosecond science, there is a growing demand for precise measurements of the optical-field, including carrier-envelope phase. The current mainstream methods using noble gases require vacuum equipments and high intensity laser. In order to overcome this problem, we put our purpose to develop a device that can measure optica-field even at low intensity in the ambient condition. We have developed a device based on optical field emission from gold nanoantennas. As a result, we achieved tunneling electron emission below 1 nJ. In addition, we observed that an asymmetry of only 2% in the amplitude of the optical-field appears as a current modulation of 13%, demonstrating the sensitivity to the optical-field. This time, we came up with the idea of using a metal-insulator hybrid structures. By using this structure, we confirmed that the photoelectric conversion efficiency is greatly improved and the stability of the current value with long exposure time is enhanced. In conclusion, our proposed method is promising as a novel all-solid-state device for optical-field measurement.