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, TiO2 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(TiO2) 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.
Highlights
With the rapid development of semiconductor manufacturing technology, plasmonics has attracted significant attention in the past few years
We present our experiment on the Quasi-phase matching (QPM) second harmonic generation (SHG) of long-range surface plasmon polaritons (LRSPPs)
In the LRSPPs, the transmission constant is related to the thickness of the Au film, whereas the ferroelectric domain period of periodically poled lithium niobate (PPLN) is determined by the phase of the fundamental wave (FW) and second harmonic (SH) wave in QPM
Summary
With the rapid development of semiconductor manufacturing technology, plasmonics has attracted significant attention in the past few years. The thinner the metal layer, the lower the confinement of the coupled SPP and the larger the transmission distance This is why LRSPPs exhibit much longer transmission distance than LSPs. In this paper, we present our experiment on the QPM SHG of LRSPPs. To obtain SPP SHG with a high efficiency and large transmission distance, we consider a DMD structure with PPLN as the substrate, an Au film as the metal, and TiO2 as the top dielectric layer, which is used to match the extraordinary refractive index (RI) (ne) of lithium niobate (LiNbO3) so LRSPPs can be generated. The efficiency and transmission distance of the SPP SHG can be improved effectively
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