Quasi-phase-matched second harmonic generation of long-range surface plasmon polaritons

Abstract

In this paper, we experimentally demonstrate the second harmonic generation of long-range surface plasmon polaritons via quasi-phase matching in lithium niobate. After depositing a 9/13 nm thick Au film on periodically poled lithium niobate, TiO of about 2.3 μm in thickness is evaporated on the sample as a refractive-index-matching material. This dielectric (periodically poled lithium niobate)-metal(Au)-dielectric(TiO) sandwich structure can support the transmission of long-range surface plasmon polaritons through it. By designing a moderate ferroelectric domain period of periodically poled lithium niobate, the phase mismatch between the fundamental wave and second harmonic wave of the long-range surface plasmon polaritons can be compensated and a second harmonic wave can be generated effectively. This can be used to provide integrated plasmonic devices with attractive applications in quantum and classic information processing.

New Quasi-Phase-Matching Techniques Enhancing the Second Harmonic Intensity in Lamb Waves

“…Thousands of related studies had been conducted in the nonlinear optical field since then. Nowadays, QPM for a higher-order harmonic generation has been extensively theorized and experimentally studied in optical nonlinear conversion processes [2][3][4][5][6][7][8][9].…”