Net Gain Dynamics in Actively Driven Organic Microdevices

• Applicant: Dr. Hartmut Fröb
• Subject Area: Experimental Condensed Matter Physics ; Optics, Quantum Optics and Physics of Atoms, Molecules and Plasmas
• Term: from 2016 to 2024
• Project identifier: Deutsche Forschungsgemeinschaft (DFG) - Project number 319139519

• Final Report Year: 2021

Final Report Abstract

This project focused on a detailed investigation of net gain dynamics in various organic materialbased neat films and microresonator systems. The combination of vertical organic microcavity lasers, VCSELs, with their lateral counterparts, DFBs, has led to a substantial modification of mode dispersion of the device. We observed unusual variation of lasing threshold values in the operational regime when lateral and longitudinal modes spectrally overlap and become strongly hybridized. We produced a solid-state organic microcavity laser based on a composite gain material, which consisted of PVP as the polymer matrix hosting, diluted gold nanoparticles, and PM567 organic dye as an optically active component. Despite the inherent absorption of gold nanoparticles at the emission wavelength of organic dye, we reached a lasing regime due to the local-fieldcorrected net gain characteristics of the composite cavity layer material. We have shown that vacuum deposition of CsPbBr3 perovskites yields superior ASE characteristics compared to their solution-processed counterparts. The introduction of positive optical feedback in these systems led to a further threshold reduction and switch from the ASE to a truly lasing regime. Finally, we have produced and investigated actively driven OLED/microcavity systems, which could be pumped optically or electrically, or both ways simultaneously. Our measurement results imply that simultaneous optical pumping can contribute to more efficient electrical pumping of the OLED-MC device, which is a promising result for future electrically driven organic solid-state lasers.

Publications

• “Coherent perfect absorption in one-port devices with wedged organic thin-film absorbers,” in Organic Light Emitting Materials and Devices XXII, vol. 10736, p. 107361T, International Society for Optics and Photonics, Sept. 2018
  T. Henseleit, M. Sudzius, H. Fröb, and K. Leo
  
• “Coherent perfect absorption in wedged organic thin films: a method to determine optical properties,” Opt. Lett., vol. 43, no. 16, pp. 4013–4016, 2018
  T. Henseleit, M. Sudzius, H. Fröb, and K. Leo
  (See online at https://doi.org/10.1364/ol.43.004013)
• “Dispersion and lasing characteristics of cross-coupled resonances in composite-cavity microresonators,” Phys. Rev. B, vol. 98, no. 8, p. 085154, 2018
  T. Wagner, M. Sudzius, H. Fröb, and K. Leo
  (See online at https://doi.org/10.1103/PhysRevB.98.085154)
• “Optically pumped lasing of an electrically active hybrid OLED-microcavity,” Appl. Phys. Lett., vol. 112, no. 11, p. 113301, 2018
  S. Meister, R. Brückner, M. Sudzius, H. Fröb, and K. Leo
  (See online at https://doi.org/10.1063/1.5016244)
• “Intracavity metal contacts for organic microlasers,” J. of Mater. Res., vol. 34, no. 4, pp. 571–578, 2019
  S. Meister, R. Brückner, M. Sudzius, H. Fröb, and K. Leo
  (See online at https://doi.org/10.1557/jmr.2018.457)
• “Controllable coherent absorption of counterpropagating laser beams in organic microcavities,” Appl. Phys. Lett., vol. 117, no. 5, p. 053301, 2020
  C. Schmidt, M. Sudzius, S. Meister, H. Fröb, and K. Leo
  (See online at https://doi.org/10.1063/5.0016544)
• “Controlling and optimizing amplified spontaneous emission in perovskites,” ACS Appl. Mater. Interfaces, vol. 12, no. 31, pp. 35242–35249, 2020
  C. Cho, A. Palatnik, M. Sudzius, R. Grodofzig, F. Nehm, and K. Leo
  (See online at https://doi.org/10.1021/acsami.0c08870)
• “Coherent optical interaction between plasmonic nanoparticles and small organic dye molecules in microcavities,” Appl. Phys. Lett., vol. 118, no. 1, p. 013301, 2021
  K. Mosshammer, M. Sudzius, S. Meister, H. Fröb, A. M. Steiner, A. Fery, and K. Leo
  (See online at https://doi.org/10.1063/5.0027321)
• “Coupled topological interface states,” Phys. Rev. B, vol. 103, no. 8, p. 085412, 2021
  C. Schmidt, A. Palatnik, M. Sudzius, S. Meister, and K. Leo
  (See online at https://doi.org/10.1103/PhysRevB.103.085412)
• “Resonant enhancement of cavity exciton-polaritons via a Fano-type interaction in organic microcavities,” ACS Photonics, vol. 8, no. 4, pp. 1034–1040, 2021
  T. Henseleit, M. Sudzius, S. Meister, and K. Leo
  (See online at https://doi.org/10.1021/acsphotonics.1c00194)