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Enhanced Terahertz Phonon Polariton in Lithium Niobate Chip
Authors:Baolong Zhang  Yifei Li  Xiaojun Wu  Xitan Xu  Yao Lu  Qiang Wu  Xuan Wang  Hongyi Lei  Jinglong Ma  Guoqian Liao  Yutong Li
Institution:1. Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, 100190 China;2. School of Electronic and Information Engineering, Beihang University, Beijing, 100191 China;3. MOE Key Laboratory of Weak-Light Nonlinear Photonics, TEDA Applied Physics Institute and School of Physics, Nankai University, Tianjin, 300457 China;4. Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, 100190 China

Songshan Lake Materials Laboratory, Dongguan, Guangdong, 523808 China;5. Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, 100190 China

School of Physical Sciences, University of Chinese Academy of Sciences, Beijing, 100049 China

Abstract:Terahertz (THz) phonon polaritons, fundamental quasi-particles that couple lattice vibrations with electromagnetic fields at THz frequencies, are found in a variety of materials that offer the potential for a wide range of THz optoelectronic devices and on-chip integrated systems. However, these compact devices and on-chip systems are hampered by the absence of on-chip powerful THz phonon polariton sources. In this study, the efficient generation and amplification of THz phonon polaritons are proposed and directly visualized on a lithium niobate (LN) chip via a tilted pulsefront phase matching technique. By combining lateral pumping and phase matching schemes, two orders of magnitude are successfully attained in the interaction distance between the pump light and the LN chip, accompanied by a substantial amplification of generated THz phonon polariton. The results of this study may lead to abundant potential applications in chip scale THz photonic devices and systems based on LN materials and its integrated heterostructures.
Keywords:lithium niobate  phonon polariton  terahertz wave  tilted pulse front
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