Publications & Papers

J. Gamboa, X. Shen, T. Hamidfar, S. A. Mitu, and S. M. Shahriar, "Debiased Opto-electronic Joint Transform Correlator for Enhanced Real-Time Pattern Recognition," Optics Express 33(13), 28640–28649 (2025).

X. Shen*, J. Gamboa*, T. Hamidfar, S. A. Mitu, and S. M. Shahriar, "Ultra-Fast Real-Time Target Recognition Using a Shift, Scale, and Rotation Invariant Hybrid Opto-Electronic Joint Transform Correlator," The Journal of the Astronautical Sciences 72, no. 5 (2025). *Equal contribution.

J. Gamboa, T. Hamidfar, X. Shen, and S. M. Shahriar, "Elimination of optical phase sensitivity in a shift, scale, and rotation invariant hybrid opto-electronic correlator via off-axis operation," Optics Express 31(4), 5990–6002 (2023).

J. Gamboa, T. Hamidfar, J. Vonckx, M. Fouda, and S. M. Shahriar, "Thick PQ:PMMA transmission holograms for free-space optical communication via wavelength-division multiplexing," Applied Optics 60(28), 8851–8857 (2021).

J. Gamboa, T. Hamidfar, and S. M. Shahriar, "Integration of a PQ:PMMA holographic memory device into the hybrid opto-electronic correlator for shift, scale, and rotation invariant target recognition," Optics Express 29(24), 40194–40204 (2021).

J. Gamboa, T. Hamidfar, J. Bonacum, and S. M. Shahriar, "Determination of the refractive index modulation of PQ:PMMA holographic phase gratings over a large spectral range through a two-level approximation of the electric susceptibility," Optical Materials Express 11(11), 3627–3635 (2021).

J. Gamboa, M. Fouda, and S. M. Shahriar, "Demonstration of shift, scale, and rotation invariant target recognition using the hybrid opto-electronic correlator," Optics Express 27(12), 16507–16520 (2019).

J. Gamboa, T. Hamidfar, X. Shen, S. A. Mitu, S. M. Shahriar, "Highly Enhanced Pattern Recognition with a Balanced Joint Transform Correlator," CLEO: Applications and Technology, AM4A.1 (2024).

X. Shen, J. Gamboa, T. Hamidfar, S. Mitu, S. Shahriar, "Ultra-Fast Real-Time Target Recognition Using a Shift, Scale, and Rotation Invariant Hybrid Opto-Electronic Joint Transform Correlator," Advanced Maui Optical and Space Surveillance Technologies Conference (2024).

X. Shen, J. Gamboa, T. Hamidfar, S. A. Mitu, S. M. Shahriar, "Speed Invariant Opto-atomic Spatio-temporal Holographic Correlator for Automatic Event Recognition Using the Mellin Transform," CLEO: Science and Innovations, JTh2A.186 (2024).

X. Shen, J. Gamboa, T. Hamidfar, S. M. Shahriar, "Investigation of frequency invariance in automated event recognition using resonant atomic media," Practical Holography XXXVIII: Displays, Materials, and Applications 12910, 92–98 (2024).

A. Tiwari, J. Gamboa, T. Hamidfar, X. Shen, S. A. Mitu, S. M. Shahriar, "Opto-electronic Balanced Joint Transform Correlator as a Convolution Stage for Neural Networks," Laser Science, JTu4A.55 (2024).

T. Hamidfar, J. Gamboa, X. Shen, J. Bonacum, S. M. Shahriar, "Expanding the field of view in PQ:PMMA volume holograms using a cylindrical substrate geometry," Practical Holography XXXVIII, PC1291006 (2024).

J. Gamboa, X. Shen, T. Hamidfar, S. M. Shahriar, "High-speed Opto-electronic Pre-processing of Polar Mellin Transform for Shift, Scale and Rotation Invariant Image Recognition at Record-Breaking Speeds," Advanced Maui Optical and Space Surveillance Technologies Conference (2023).

A. Tiwari, J. Gamboa, T. Hamidfar, X. Shen, S. M. Shahriar, "Use of a Hybrid Opto-electronic Correlator for High-Speed Pattern Recognition in Fundamental Science Applications," Frontiers in Optics, JW4A.77 (2023).

X. Shen, J. Gamboa, T. Hamidfar, S. M. Shahriar, "Temporal Scale-Invariance for Automatic Event Recognition Using the Mellin Transform," Laser Science, JW4A.75 (2023).

J. Gamboa, T. Hamidfar, X. Shen, S. M. Shahriar, "Optical Phase Insensitive Off-axis Operation of the Hybrid Opto-electronic Correlator for Ultra-fast Shift, Scale, and Rotation Invariant Target Recognition," CLEO: Applications and Technology, ATu3K.1 (2023).

J. Gamboa, T. Hamidfar, X. Shen, J. Bonacum, S. M. Shahriar, "Monocular passive ranging through a PQ:PMMA holographic wavelength division demultiplexer," Practical Holography XXXVII 12445, 150–155 (2023).

X. Shen, J. Gamboa, T. Hamidfar, J. Bonacum, S. M. Shahriar, "Holographic diffraction of complex beams and gratings: theory and simulation," Practical Holography XXXVII 12445, 156–162 (2023).

T. Hamidfar, J. Gamboa, X. Shen, J. Vonckx, J. Bonacum, S. M. Shahriar, "PQ:PMMA Holographic Optical Communication System for Free Space WDM and Demultiplexing at 1550 nm," Laser Science, JW5A.45 (2022).

J. Gamboa, T. Hamidfar, X. Shen, S. M. Shahriar, "Optical Correlation of 1D Time-Domain Signals Through a Spectrogram Time-Space Transform," Laser Science, JW5A.70 (2022).

J. Gamboa, X. Shen, T. Hamidfar, S. M. Shahriar, "Ultrafast image retrieval from a holographic memory disc for high-speed operation of a shift, scale, and rotation invariant target recognition system," Advanced Maui Optical and Space Surveillance Technologies Conference (2022).

T. Hamidfar, J. Gamboa, X. Shen, S. M. Shahriar, "High-Speed Automatic Target Recognition using the Hybrid Opto-electronic Correlator with Multi-channel Detection," CLEO: Applications and Technology, JW3A.4 (2022).

J. Gamboa, T. Hamidfar, J. Bonacum, S. M. Shahriar, "Single-wavelength writing for free space WDM holograms at arbitrary wavelengths," Practical Holography XXXVI 12026, 46–50 (2022).

J. Gamboa, T. Hamidfar, S. M. Shahriar, "Shift Invariant Correlation using the Hybrid Optoelectronic Correlator with a PQ:PMMA Holographic Memory Device," Frontiers in Optics, FW5B.5 (2021).

J. Gamboa, J. Vonckx, M. Fouda, S. M. Shahriar, "PQ:PMMA Holographic Wavelength Division Multiplexing Filters For Use in Monocular Passive Ranging and Free Space Optical Communications," Frontiers in Optics + Laser Science (2020).

J. Gamboa, M. Fouda, S. M. Johnson, S. M. Shahriar, "Demonstration of Shift, Scale, and Rotation Invariant Target Recognition Using Polar Mellin Transforms in a Hybrid Opto-Electronic Correlator," Advanced Maui Optical and Space Surveillance Technologies Conference (2019).