Second-harmonic reflectors on 128 ̊ LiNbO3

Short reflectors operating at the fundamental and second harmonics on 128 ̊ LiNbO3

In this work, we study numerically the operation of surface acoustic wave (SAW) reflectors comprising a small number of electrodes on the 128 YX-cut lithium niobate (LiNbO3) substrate. The electrodes have a finite thickness, and they are either open circuited or grounded. The center-to-center distance between adjacent electrodes d corresponds roughly either to half of the characteristic wavelen...

Minimum-loss short reflectors on 128 ̊ LiNbO3

We consider the interaction of surface acoustic waves (SAWs) with short electrode gratings encompassing only few electrodes on 128 lithium niobate (LiNbO3). The qualifications of the reflectors are evaluated by comparing the part of incident SAW energy scattered by the structure into the bulk to the energy reflected back as a SAW.

Phases of the SAW reflection and transmission coefficients for short reflectors on 128 ̊ LiNbO3

Propagation Characteristics of Surface Acoustic Waves in AlN/128°Y-X LiNbO3 Structures

In this study, propagation characteristics of surface acoustic waves in a layered piezoelectric structure (AlN/128°Y-X LiNbO3) are investigated. The phase velocity and coupling coefficient of the layered structure with interdigital transducers and/or metal thin films deposited at various interfaces will be calculated numerically. The effects of the polarity of 128°Y-X LiNbO3 on SAW characterist...

Quasi-phase matching in LiNbO3 using nonlinear coefficients in the XY plane

We report quasi-phase-matched second-harmonic generation in periodically poled lithium niobate (PPLN), where both fundamental and second-harmonic waves are ordinary waves. It provides a lower-limit value for d22 of 1.1 pm/V. The measured temperature and wavelength bandwidth of the second-harmonic signal are in good agreement with the theoretical predictions. Since the d22 = dYYY nonlinear coeff...