Kevin P. Pikul

University of Illinois Urbana-Champagne
  • May 11, 2022 // 3:20pm

    9.5 Impact of Diffusion Mask Strain on Impurity-Induced Disordered VCSELs Designed for Single-Fundamental-Mode Operation

    Patrick Su, University of Illinois at Urbana-Champaign
    John M Dallesasse, University of Illinois at Urbana-Champaign
    Mark Kraman, University of Illinois Urbana-Champagne
    Kevin P. Pikul, University of Illinois Urbana-Champagne

    Student Presentation

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  • 9.6.2021 Standing Wave Engineering for Mode Control in Single-Mode Oxide-Confined Vertical-Cavity Surface-Emitting Lasers

    Kevin P. Pikul, University of Illinois Urbana-Champagne
    Patrick Su, University of Illinois at Urbana-Champaign
    Mark Kraman, University of Illinois Urbana-Champagne
    Fu-Chen Hsiao, North Carolina State University
    John Dallesasse, University of Illinois at Urbana-Chamapign
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  • 14.3.2023 Silicon Anti-Phase Optical Coatings for High-Power, Single-Mode Operation in Vertical-Cavity Surface-Emitting Lasers

    Kevin P. Pikul, University of Illinois Urbana-Champagne
    Leah Espenhahn, University of Illinois at Urbana-Champaign
    Patrick Su, University of Illinois at Urbana-Champaign
    Mark Kraman, University of Illinois Urbana-Champagne
    John M Dallesasse, University of Illinois at Urbana-Champaign

    14.3.2023 CSMANTECH-2023-Kevin-Pikul-Extended-Abstract

  • 8.2.3.2024 Polarization Control in Vertical-Cavity Surface-Emitting Lasers via Elliptical Aperture Definition in Optical Coatings

    Kevin P. Pikul, University of Illinois Urbana-Champagne
    Leah Espenhahn, University of Illinois at Urbana-Champaign
    Patrick Su, University of Illinois at Urbana-Champaign
    John M Dallesasse, University of Illinois at Urbana-Champaign

    8.2.3.2024 Polarization Control in Vertical-Cavity Surface-Emitting Lasers via Elliptical

  • 6B.2 – Design of Novel Long-Wavelength VCSEL Structure with Voltage- Controllable Phase-Matching Layer for Standing Wave Tuning

    Kevin P. Pikul, University of Illinois Urbana-Champagne
    Leah Espenhahn, University of Illinois at Urbana-Champaign
    J. Flanagan, University of Illinois Urbana-Champagne
    E. Becher, University of Illinois at Urbana-Champaign
    J.M. Dallesasse, University of Illinois at Urbana-Champaign

    6B.2 Final.2025

    A novel long wavelength 1550 nm VCSEL structure is introduced utilizing an InP-based substrate and bottom DBR mirror, a dielectric silicon/silicon dioxide top DBR mirror, and a tunable phase-matching layer fabricated from a piezo-electric/electro-optic material. By applying a voltage bias across this phase-matching layer, the layer’s optical thickness can be altered, thereby shifting the overlap of the electric-field standing-wave pattern with
    the gain region. When process variation/nonuniformity negatively impact the device performance, mainly threshold current and threshold modal gain, tuning of the
    phase matching layer can optimize the standing wave overlap with the gain region, minimizing threshold current and modal gain. This work presents the novel
    epitaxial structure designed and explores the viability of various materials for application as the phase-matching layer via simulation results utilizing the transfer-matrix method.

  • 10A.4 – Single-Mode, Polarization Stable 2D-VCSEL Arrays via Elliptical Disorder-Defined Apertures

    Kevin P. Pikul, University of Illinois Urbana-Champagne
    Leah Espenhahn, University of Illinois at Urbana-Champaign
    P. Su, University of Illinois at Urbana-Champaign
    Mark Kraman, University of Illinois Urbana-Champagne
    J.M. Dallesasse, University of Illinois at Urbana-Champaign

    10A.4 Final.2025

    2D-VCSEL arrays utilizing elliptical disorder-defined apertures for simultaneous single-mode, singlepolarization operation are demonstrated. Optical losses induced by the disordered region in the periphery of the VCSEL suppress the capability of higher-order modes from lasing, achieving single-fundamental mode
    operation. Furthermore, introducing eccentricity to the aperture creates an asymmetric threshold gain, or dichroism, that selectively suppresses one of the two polarization states inherent to VCSELs, resulting in single-polarization operation. The work presented here discusses the design, fabrication, and characterization results of the 2D-VCSEL arrays. The arrays are characterized for optical output power, single-mode performance via optical spectra measurements, and single-polarization performance via polarization-resolved light-current-voltage (PR-LIV) curves.