TY - JOUR
T1 - Concept of annular vector beam generation at terahertz wavelengths via a nonlinear parametric process
AU - Saito, Kyosuke
AU - Tanabe, Tadao
AU - Oyama, Yutaka
PY - 2015/4/1
Y1 - 2015/4/1
N2 - In this paper, we describe our theoretical investigation and calculations for a terahertz (THz)-wave profile generated by difference frequency mixing (DFM) of focused, cylindrically symmetric, and polarized optical vector beams. Using vector diffraction theory, the second-order nonlinear polarization was estimated from the electric field components of the optical pump beams penetrating uniaxial, birefringent nonlinear optics (NLO) crystals, GaSe and CdSe. The approximate beam patterns of the THz waves were simulated using DFM formulation. The intensity patterns of the THz waves for GaSe and CdSe showed sixfold symmetry and cylindrical symmetry, respectively, based on the nonlinear susceptibility tensor of the crystals. As the phase-matching angle θPM was constant with respect to the c axis of the NLO crystals, an annular vector beam with a narrow width was expected.
AB - In this paper, we describe our theoretical investigation and calculations for a terahertz (THz)-wave profile generated by difference frequency mixing (DFM) of focused, cylindrically symmetric, and polarized optical vector beams. Using vector diffraction theory, the second-order nonlinear polarization was estimated from the electric field components of the optical pump beams penetrating uniaxial, birefringent nonlinear optics (NLO) crystals, GaSe and CdSe. The approximate beam patterns of the THz waves were simulated using DFM formulation. The intensity patterns of the THz waves for GaSe and CdSe showed sixfold symmetry and cylindrical symmetry, respectively, based on the nonlinear susceptibility tensor of the crystals. As the phase-matching angle θPM was constant with respect to the c axis of the NLO crystals, an annular vector beam with a narrow width was expected.
UR - http://www.scopus.com/inward/record.url?scp=84942374475&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84942374475&partnerID=8YFLogxK
U2 - 10.1364/AO.54.002769
DO - 10.1364/AO.54.002769
M3 - Article
AN - SCOPUS:84942374475
VL - 54
SP - 2769
EP - 2775
JO - Applied Optics
JF - Applied Optics
SN - 0003-6935
IS - 10
ER -