Verification of dynamical Casimir effect with metamaterials

Research Project

Project/Area Number	25610072
Research Category	Grant-in-Aid for Challenging Exploratory Research
Allocation Type	Multi-year Fund
Research Field	Condensed matter physics I
Research Institution	Shinshu University
Principal Investigator	TAKEDA Mitsuo 信州大学, 理学部, 教授 (20115653)
Project Period (FY)	2013-04-01 – 2016-03-31
Project Status	Completed (Fiscal Year 2015)
Budget Amount *help	¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000) Fiscal Year 2015: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000) Fiscal Year 2014: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000) Fiscal Year 2013: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
Keywords	動的カシミール効果 / メタマテリアル / 光の局在 / 電磁誘起透明化現象 / 超音波振動子 / 圧電素子 / テラヘルツ時間領域分光
Outline of Final Research Achievements	The purpose of this study is to demonstrate photon pair generation by means of ultrasonic vibrating mirrors covered with metamaterials that can localize electromagnetic waves. One of surface of silicon mirror was covered with metamaterials constructed with metallic split rings and bars. Piezoelectric ZnO was coated on the other surface of the mirror as an ultrasonic vibrator. By terahertz time-domain spectroscopy, the group velocity delay due to the electromagnetically induced transparency was confirmed. The reflection echo related to the ultrasonic vibration at 400 MHz was confirmed in the ultrasonic waveform. However, generation of the electromagnetic waves was not confirmed. The study is now in progress.