Broadband mid-infrared second harmonic generation using epitaxial polydomain barium titanate thin films

Junchao Zhou; Wenrui Zhang; Mingzhao Liu; Pao Tai Lin

doi:10.1364/PRJ.7.001193

Journals >Photonics Research >Volume 7 >Issue 10 >Page 1193 > Article

Photonics Research
Vol. 7, Issue 10, 1193 (2019)

Broadband mid-infrared second harmonic generation using epitaxial polydomain barium titanate thin films | Editors' Pick

Junchao Zhou^1、2、3, Wenrui Zhang⁴, Mingzhao Liu⁴, and Pao Tai Lin^{1、2、3、*}

Author Affiliations

¹Department of Electrical and Computer Engineering, Texas A&M University, College Station, Texas 77843, USA

²Department of Materials Science and Engineering, Texas A&M University, College Station, Texas 77843, USA

³Center for Remote Health Technologies and Systems, Texas A&M University, College Station, Texas 77843, USA

⁴The Center for Functional Nanomaterials, Brookhaven National Laboratory, Upton, New York 11973, USA

show less

DOI: 10.1364/PRJ.7.001193 Cite this Article Set citation alerts

Junchao Zhou, Wenrui Zhang, Mingzhao Liu, Pao Tai Lin. Broadband mid-infrared second harmonic generation using epitaxial polydomain barium titanate thin films[J]. Photonics Research, 2019, 7(10): 1193 Copy Citation Text

EndNote(RIS)

BibTex

Plain Text

show less

Abstract

The mid-infrared (mid-IR) second-order optical nonlinearity of the barium titanate (BTO) thin films was characterized by second harmonic generation (SHG). The epitaxial BTO thin films were grown on strontium titanate substrates by pulsed-laser deposition. From the azimuthal-dependent polarized SHG measurements, the tensorial optical nonlinear coefficients,

d_{i j}

, and ferroelectric domain fraction ratio,

δ A_{Y} / δ A_{z}

, were resolved. Strong SHG signals were obtained at the pumping laser wavelength

λ

between 3.0 and 3.6 μm. The SHG intensity was linearly dependent upon the square of the pumping laser power. The broadband mid-IR optical nonlinearity enables BTO thin films for applications in chip-scale quantum optics and nonlinear integrated photonic circuits.

P_{s} = (\begin{matrix} P_{1} \\ P_{2} \\ P_{3} \end{matrix}) = (\begin{matrix} \begin{matrix} 0 & 0 & 0 \\ 0 & 0 & 0 \\ d_{31} & d_{31} & d_{33} \end{matrix} & \begin{matrix} 0 & d_{15} & 0 \\ d_{15} & 0 & 0 \\ 0 & 0 & 0 \end{matrix} \end{matrix}) (\begin{matrix} E_{1}^{2} \\ E_{2}^{2} \\ E_{3}^{2} \\ 2 E_{2} E_{3} \\ 2 E_{1} E_{3} \\ 2 E_{1} E_{2} \end{matrix}) .

(1)