Abstract
We present a theoretical investigation of the simultaneous generation of two orthogonally polarized terahertz (THz) waves by stimulated polariton scattering (SPS) with a periodically poled LiNbO3 (PPLN) crystal. The two orthogonally polarized THz waves are generated from SPS with A1 and E symmetric transverse optical (TO) modes in a LiNbO3 crystal, respectively. The parallel polarized THz wave is generated from A1 symmetric TO modes with type-0 phase-matching of e = e + e, and the perpendicular polarized THz wave is generated from E symmetric TO modes with type-I phase-matching of e = o + o. The two types of phase-matching of e = e + e and e = o + o can be almost satisfied simultaneously by accurately selecting the poling period of the PPLN crystal. We calculate the photon flux density of the two orthogonally polarized THz waves by solving the coupled wave equations. The calculation results indicate that the two orthogonally polarized THz waves can be efficiently generated, and the relative intensities between the two orthogonally polarized THz waves can be modulated.
Highlights
Stimulated polariton scattering (SPS) has proven to be an efficient scheme to generate terahertz (THz) waves [1,2,3,4,5,6,7,8]
Seede is along the z-axis of the periodically poled LiNbO3 (PPLN) crystal, whereas the electric field of Seedo is perpendicular to the z-axis of the PPLN crystal
We present the simultaneous generation of two orthogonally polarized THz waves by forward and backward SPS processes with a PPLN crystal
Summary
Stimulated polariton scattering (SPS) has proven to be an efficient scheme to generate terahertz (THz) waves [1,2,3,4,5,6,7,8]. MgO:LiNbO3 has strong second-order nonlinear response, as well as TO phonon resonances for efficient SPS [9]. MgO:LiNbO3 has five A1 symmetric infrared- and Raman-active TO modes polarized parallel to the c-axis with frequencies of 248 cm−1 , 274 cm−1 , 307 cm−1 , 628 cm−1 , and 692 cm−1 [10]. MgO:LiNbO3 has eight E symmetric infrared- and Raman-active TO modes polarized perpendicular to the c-axis with frequencies of 152 cm−1 , 236 cm−1 , 265 cm−1 , 322 cm−1 , 363 cm−1 , 431 cm−1 , 586 cm−1 , and 670 cm−1 [10]. If the SPS from A1 and E symmetric TO modes can be simultaneously excited, two orthogonally polarized THz waves can be simultaneously generated. THz waves are generated from SPS with A1 and E symmetric TO modes in a MgO:LiNbO3 crystal, respectively. We calculate the photon flux density of the two orthogonally polarized THz waves by solving the coupled wave equations
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