A Team of VCSEL and Semiconductor Device Modeling Specialists
Po.Li.Te was founded by researchers with extensive expertise in VCSEL physics and in semiconductor device modeling more broadly, built on the pioneering scientific contributions of Pierluigi Debernardi.
Po.Li.Te expertise has been validated throughout years of successful scientific collaborations. See the simulation platform and the device families it covers.
Matteo Alasio
CEO
Semiconductor device modeling, multiphysics expert
Martino D’Alessandro
CTO
Specialist in VCSEL dynamics and multimode modeling
Valerio Torrelli
R&D Lead
Focused on VCSEL modal simulations and polarization control
Alberto Gullino
VCSEL Development Engineer
Expert in VCSEL epitaxial design and carrier transport
Selected list of scientific publications
Latest result: our team set a new record for axial single-mode power in linearly-polarised VCSELs — 27 mW from a donut-shaped aperture design, developed as part of the QYRO project toward the first satellite-based quantum gyroscope. Simulations point to 100 mW as the next milestone.
V. Torrelli, A. Gullino, J. Lindner, G. Moiso, M. D’Alessandro, and S. Gronenborn, “Beyond 30 mW of Single-Mode Power in Linearly-Polarised VCSELs,” in IEEE Journal of Selected Topics in Quantum Electronics, vol. 32, no. 6, no. 1701012 (2026), doi: 10.1109/JSTQE.2026.3710026
M. D’Alessandro, V. Torrelli, A. Gullino, M. G. C. Alasio, A. Nespola, S. Romero García, and P. Debernardi, “Design and modeling of asymmetric bow-tie VCSELs for 100 GHz and beyond,” in Optics Express 34, 7979-7995 (2026), doi: 10.1364/OE.578425
V. Torrelli, M. D’Alessandro, A. Gullino, M. G. C. Alasio, A. Tibaldi, C. Chang-Hasnain, and P. Debernardi, “Elliptically polarized light obtained from tilted high-contrast grating VCSELs,” in Optics Letters 51, 29-32 (2026), doi: 10.1364/OL.583070
V. Torrelli, L. Miri, M. D’Alessandro, A. Gullino, M. Zimmer, K. Dahler, M. Jetter, P. Michler, W. Elsäßer, F. Bertazzi, A. Tibaldi, and P. Debernardi, “Elliptical polarization in VCSELs via joint interaction of a tilted sub-wavelength grating and intrinsic semiconductor anisotropies,” in Optics Letters 50, 3082-3085 (2025), doi: 10.1364/OL.557703
M. D’Alessandro, V. Torrelli, F. Bertazzi, M. Goano, N. N. Ledentsov, M. Lindemann, M. Gioannini, P. Debernardi, A. Tibaldi, “Transverse Coupled Cavity VCSELs: Bridging Ultrabroadband Dynamics to Optical Supermodes,” in IEEE Photonics Journal, vol. 16, no. 2, pp. 1-7, no. 0600807 (2024), doi: 10.1109/JPHOT.2024.3373171.
N. Ledentsov Jr., V. A. Shchukin, Ł. Chorchos, O. Yu. Makarov, J.-R. Kropp, I. E. Titkov, V. P. Kalosha, V. Zerova, M. Lindemann, N. C. Gerhardt, M. D’Alessandro, V. Torrelli, P. Debernardi, A. Tibaldi, M. R. Hofmann, N. N. Ledentsov, “Analysis of laterally-coupled-cavity VCSELs for ultra-high-frequency photon-photon resonance modulation,” in Proc. SPIE 12904, Vertical-Cavity Surface-Emitting Lasers XXVIII, 1290405 (13 March 2024), doi: 10.1117/12.3001177
V. Torrelli, M. D’Alessandro, W. Elsäßer, and P. Debernardi, “On-demand polarization by a vertical-cavity surface-emitting laser with two tilted sub-wavelength gratings,” in Optics Letters 49, 3773-3776 (2024), doi: 10.1364/OL.528268
V. Torrelli, A. Gullino, A. Tibaldi, F. Bertazzi, M. Goano and P. Debernardi, “High-Power Emission via Large-Area VCSELs With Single High-Order Mode Operation,” in IEEE Photonics Journal, vol. 16, no. 2, pp. 1-7, no. 0600507 (2024), doi: 10.1109/JPHOT.2024.3360992
A. Gullino, V. Torrelli, M. D’Alessandro, A. Tibaldi, F. Bertazzi, M. Goano, P. Debernardi, “AlGaAs Tunnel Junction (TJ)-VCSELs: A NEGF–Drift-Diffusion Approach,” in IEEE Photonics Journal, vol. 16, no. 2, pp. 1-9, no. 0600409 (2024), doi: 10.1109/JPHOT.2024.3360897
A. Tibaldi, J. A. G. Montoya, M. G. C. Alasio, A. Gullino, A. Larsson, P. Debernardi, M. Goano, M. Vallone, G. Ghione, E. Bellotti, F. Bertazzi, “Analysis of Carrier Transport in Tunnel-Junction Vertical-Cavity Surface-Emitting Lasers by a Coupled Nonequilibrium Green’s Function–Drift-Diffusion Approach,” in Physical Review Applied, vol. 14, no. 2, p. 024037 (2020), doi: 10.1103/PhysRevApplied.14.024037
Acknowledgement
We gratefully acknowledge Pierluigi Debernardi (CNR) for his continuous support and guidance as scientific advisor. His extensive experience in VCSEL numerical modeling and his contributions to the underlying theoretical framework have been instrumental in guiding the development of the approach.
Thank you Pierluigi!
Reference papers:
Debernardi, Pierluigi, and Gian Paolo Bava. “Coupled mode theory: a powerful tool for analyzing complex VCSELs and designing advanced device features.” IEEE Journal of selected topics in quantum electronics 9.3 (2003): 905-917.
Bienstman, Peter, et al. “Comparison of optical VCSEL models on the simulation of oxide-confined devices.” IEEE Journal of Quantum Electronics 37.12 (2001): 1618-1631.