@article{51339,
  author       = {{Babai-Hemati, Jonas and vom Bruch, Felix and Herrmann, Harald and Silberhorn, Christine}},
  issn         = {{1094-4087}},
  journal      = {{Optics Express}},
  keywords     = {{Atomic and Molecular Physics, and Optics}},
  publisher    = {{Optica Publishing Group}},
  title        = {{{Tailored second harmonic generation inTi-diffused PPLN waveguides usingmicro-heaters}}},
  doi          = {{10.1364/oe.510319}},
  year         = {{2024}},
}

@article{33672,
  abstract     = {{<jats:title>Abstract</jats:title>
               <jats:p>Lithium niobate is a promising platform for integrated quantum optics. In this platform, we aim to efficiently manipulate and detect quantum states by combining superconducting single photon detectors and modulators. The cryogenic operation of a superconducting single photon detector dictates the optimisation of the electro-optic modulators under the same operating conditions. To that end, we characterise a phase modulator, directional coupler, and polarisation converter at both ambient and cryogenic temperatures. The operation voltage <jats:inline-formula>
                     <jats:tex-math><?CDATA $V_{\pi/2}$?></jats:tex-math>
                     <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
                        <mml:msub>
                           <mml:mi>V</mml:mi>
                           <mml:mrow>
                              <mml:mi>π</mml:mi>
                              <mml:mrow>
                                 <mml:mo>/</mml:mo>
                              </mml:mrow>
                              <mml:mn>2</mml:mn>
                           </mml:mrow>
                        </mml:msub>
                     </mml:math>
                     <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="jpphotonac6c63ieqn1.gif" xlink:type="simple" />
                  </jats:inline-formula> of these modulators increases, due to the decrease in the electro-optic effect, by 74% for the phase modulator, 84% for the directional coupler and 35% for the polarisation converter below 8.5<jats:inline-formula>
                     <jats:tex-math><?CDATA $\,\mathrm{K}$?></jats:tex-math>
                     <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
                        <mml:mrow>
                           <mml:mi mathvariant="normal">K</mml:mi>
                        </mml:mrow>
                     </mml:math>
                     <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="jpphotonac6c63ieqn2.gif" xlink:type="simple" />
                  </jats:inline-formula>. The phase modulator preserves its broadband nature and modulates light in the characterised wavelength range. The unbiased bar state of the directional coupler changed by a wavelength shift of 85<jats:inline-formula>
                     <jats:tex-math><?CDATA $\,\mathrm{nm}$?></jats:tex-math>
                     <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
                        <mml:mrow>
                           <mml:mi mathvariant="normal">n</mml:mi>
                           <mml:mi mathvariant="normal">m</mml:mi>
                        </mml:mrow>
                     </mml:math>
                     <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="jpphotonac6c63ieqn3.gif" xlink:type="simple" />
                  </jats:inline-formula> while cooling the device down to 5<jats:inline-formula>
                     <jats:tex-math><?CDATA $\,\mathrm{K}$?></jats:tex-math>
                     <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
                        <mml:mrow>
                           <mml:mi mathvariant="normal">K</mml:mi>
                        </mml:mrow>
                     </mml:math>
                     <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="jpphotonac6c63ieqn4.gif" xlink:type="simple" />
                  </jats:inline-formula>. The polarisation converter uses periodic poling to phasematch the two orthogonal polarisations. The phasematched wavelength of the utilised poling changes by 112<jats:inline-formula>
                     <jats:tex-math><?CDATA $\,\mathrm{nm}$?></jats:tex-math>
                     <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
                        <mml:mrow>
                           <mml:mi mathvariant="normal">n</mml:mi>
                           <mml:mi mathvariant="normal">m</mml:mi>
                        </mml:mrow>
                     </mml:math>
                     <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="jpphotonac6c63ieqn5.gif" xlink:type="simple" />
                  </jats:inline-formula> when cooling to 5<jats:inline-formula>
                     <jats:tex-math><?CDATA $\,\mathrm{K}$?></jats:tex-math>
                     <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
                        <mml:mrow>
                           <mml:mi mathvariant="normal">K</mml:mi>
                        </mml:mrow>
                     </mml:math>
                     <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="jpphotonac6c63ieqn6.gif" xlink:type="simple" />
                  </jats:inline-formula>.</jats:p>}},
  author       = {{Thiele, Frederik and vom Bruch, Felix and Brockmeier, Julian and Protte, Maximilian and Hummel, Thomas and Ricken, Raimund and Quiring, Viktor and Lengeling, Sebastian and Herrmann, Harald and Eigner, Christof and Silberhorn, Christine and Bartley, Tim}},
  issn         = {{2515-7647}},
  journal      = {{Journal of Physics: Photonics}},
  keywords     = {{Electrical and Electronic Engineering, Atomic and Molecular Physics, and Optics, Electronic, Optical and Magnetic Materials}},
  number       = {{3}},
  publisher    = {{IOP Publishing}},
  title        = {{{Cryogenic electro-optic modulation in titanium in-diffused lithium niobate waveguides}}},
  doi          = {{10.1088/2515-7647/ac6c63}},
  volume       = {{4}},
  year         = {{2022}},
}

@article{26391,
  author       = {{Xu, Yazhi and Wang, Xudong and Zhang, Wei and Schäfer, Lisa and Reindl, Johannes and vom Bruch, Felix and Zhou, Yuxing and Evang, Valentin and Wang, Jiang‐Jing and Deringer, Volker L. and Ma, En and Wuttig, Matthias and Mazzarello, Riccardo}},
  issn         = {{0935-9648}},
  journal      = {{Advanced Materials}},
  title        = {{{Materials Screening for Disorder‐Controlled Chalcogenide Crystals for Phase‐Change Memory Applications}}},
  doi          = {{10.1002/adma.202006221}},
  year         = {{2021}},
}

@article{22771,
  author       = {{Stefszky, Michael and Santandrea, Matteo and vom Bruch, Felix and Krapick, S. and Eigner, Christof and Ricken, R. and Quiring, V. and Herrmann, Harald and Silberhorn, Christine}},
  issn         = {{1094-4087}},
  journal      = {{Optics Express}},
  title        = {{{Waveguide resonator with an integrated phase modulator for second harmonic generation}}},
  doi          = {{10.1364/oe.412824}},
  year         = {{2020}},
}

@article{20157,
  author       = {{Thiele, Frederik and vom Bruch, Felix and Quiring, Victor and Ricken, Raimund and Herrmann, Harald and Eigner, Christof and Silberhorn, Christine and Bartley, Tim}},
  issn         = {{1094-4087}},
  journal      = {{Optics Express}},
  title        = {{{Cryogenic electro-optic polarisation conversion in titanium in-diffused lithium niobate waveguides}}},
  doi          = {{10.1364/oe.399818}},
  year         = {{2020}},
}

