Publications & Patents
Our publications cover a wide range of topics that collectively address system optimization of multibeam, multiband sensing and communication networks. Below is an up-to-date list of our recent publications and patents. You can also track our research on our Google Scholar pages.
- Hannah Sinigaglio, Janusz Murakowski, Timothy Creazzo, Dennis Prather, “Angle of Arrival Detection using Photonic Integrated Circuit and Array-Beam Space Mapping,” accepted for publication, Proc. IEEE International Symposium on Phased Array Systems and Technology, Boston, MA, USA, 2024
- Timothy Creazzo, Chase Stine, Connor Creavin, Charles Harrity, Kevin Shreve, Fuquan Wang, Peng Yao, Janusz Murakowski, Garrett Schneider, Shouyuan Shi, Christopher Schuetz, Dennis W Prather, “Silicon Photonic Integrated Circuit Beamformer for RF Photonic Applications,” 2024 IEEE/MTT-S International Microwave Symposium – IMS 2024, Washington, DC, USA, 2024, pp. 70-73, doi: 10.1109/IMS40175.2024.10600182.
- Charles Harrity, Aqib Adib Mahmud, Garrett Schneider, Timothy Creazzo, Janusz Murakowski, David Chester, Kimba Clyne, Thomas Mascitelli, Christopher Schuetz, Dennis W Prather, “Tunable Optically Fed Radiofrequency Source for Distributing Coherent High-Fidelity Signals,” 2024 IEEE/MTT-S International Microwave Symposium – IMS 2024, Washington, DC, USA, 2024, pp. 86-89, doi: 10.1109/IMS40175.2024.10600269.
- S. I. Chowdhury, J. N. Mait, X.–F. Qi, S. Shi, G. Schneider, D. W. Prather, J. Murakowski, C. A. Schuetz, “Two-Dimensional Radio-Frequency Holography Using Distributed Apertures,” 2024 IEEE Conference on Computational Imaging Using Synthetic Apertures (CISA), Boulder, CO, USA, 2024, pp. 01-05, doi: 10.1109/CISA60639.2024.10576473.
- J. Murakowski, C. Schuetz, S. Shi, G. Schneider and D. Prather, “Distributing Coherence Among Phased Arrays,” 2024 IEEE Conference on Computational Imaging Using Synthetic Apertures (CISA), Boulder, CO, USA, 2024, pp. 01-05, doi: 10.1109/CISA60639.2024.10576520.
- S. Shi, F. Wang, J. Abney, Z. Aranda, G. Schneider, C. Schuetz, C. Harrity, M. Zablocki, S. Dontamsetti, R. Lawrence, and D.W. Prather, “Ultrawideband Modular RF Frontend Development for Photonically-Enabled Imaging Receiver,” Invited Paper: IEEE Microwave and Wireless Technology Letters, accepted for publication, 2024.
- X. Zhu, M. de Freitas, S. Shi, A. Mercante, P. Yao, F. Wang, C. Cullen, and D.W. Prather, “Ultra-Wideband Dual-Output Thin-Film Lithium Niobate Intensity Modulator,” Invited Paper: IEEE Journal of Selected Topics in Quantum Electronics, in review for 2024.
- T. Creazzo and D.W. Prather, “Photonic Integrated Circuits: Silicon-Adjacent Devices for High Beam-Bandwidth Communication and Sensing,” Invited Paper: IEEE Comm. Soc. Technology News, November 1, 2023. [Online] Available: www.comsoc.org/publications/ctn/photonic-integrated-circuits-silicon-adjacent-devices-high-beam-bandwidth
- J. Murakowski, A. Hallak, A. Mercante, M. Zablocki, T. Creazzo, S. Shi, K. Shreve, M. Gallion, C. Creavin, C. Harrity, M. Gehl, M, Ogut, and D.W. Prather, “Ultra-Wideband RF-Photonics Technology for Microwave Spectrometry,” IEEE IGARSS International Geoscience and Remote Sensing Symposium, July 2023.
- D. W. Prather, S. Galli, G. J. Schneider, S. Shi, J. A. Murakowski, X.-F. Qi, C. Schuetz, “Fourier-optics based opto-electronic architectures for simultaneous multi-band, multi-beam, and wideband transmit and receive phased arrays”, IEEE Access, vol.11, pp.18082-18106, 2023.
- D. W. Prather, J. A. Murakowski, C. Schuetz, S. Shi, G. J. Schneider, C. Harrity, Z. D. Aranda, D. Marinucci, A. Hallak, M. Zablocki, M. Gallion, S. Dontamsetti, B. J. Goodman, J. Semmel, R. Lawrence, “Millimeter-Wave and Sub-THz Phased-Array Imaging Systems based on Electro-optic Up-conversion and Optical Beamforming”, Invited Paper: IEEE Journal of selected topics in quantum electronics, vol.29(5), 2023.
- D.W. Prather, C. Schuetz, T. Creazzo, and C. Stine, “Photonic Integrated Circuits in RF Beamforming for Optimized 5G/6G Wireless Communications, Invited Paper: IEEE Research and Applications of Photonics in Defense (RAPID) Conference, September 2023.
- W. L Beardell, J. A. Murakowski, G. J. Schneider, D. W. Prather, “Array-beamspace mapping for planar two-dimensional beam-forming” IEEE Access, vol. 11, pp. 77716– 77728, July 2023.
- X.-F. Qi, J. A. Murakowski, G. J. Schneider, D. W. Prather, “C-RAN at millimeter wave and above: full-beamspace radio access architecture”, recipient of the Best Paper Award: 32nd Wireless and Optical Communications Conference (WOCC), 1-6, 2023.
- W. L. Beardell, C. J. Ryan, G. J. Schneider, J. A. Murakowski, D. W. Prather, “Microwave photonic direction-finding spectrometer”, IEEE Journal of Lightwave Technology, vol. 41(10), May 2023.
- J. Bai, Y. Shen, P. Yao, D. Chen, M. Konkol, B. Guo, X. Guo, V. Carey, J. C. Campbell, and D. W. Prather, “Thermal dissipation enhancement in flip-chip bonded uni-traveling carrier photodiodes”, Optical Letters, vol. 48(19), pp. 5157-5160, 2023.
- D. W. Prather, C. Creavin, T. Creazzo, C. Harrity, J. A. Murakowski, X.-F. Qi, G. J. Schneider, C. Schuetz, S. Shi, K. Shreve, F. Wang, P. Yao, “Optically upconverted, spatially coherent phased-array-antenna feed networks for beam-space MIMO in 5G cellular communications”, Invited Paper: Optical Fiber Communication Conference, W4J. 4, San Diego, March 2023.
- P. Yao, A. Mercante, M. Konkol, B. Shopp, P. Kelly, A. Bortle, J. Whiteson, S. Shi, D. W. Prather, “A shot noise limited balanced microwave photonic link using an LNOI modulator and a MUTC BPD”, invited paper: IEEE Research and Applications of Photonics in Defense Conference (RAPID), 2023.
- D.W. Prather, “Microwave and Millimeter-wave Photonic Imaging Arrays,” invited paper: IEEE Photonics Conference (IPC), November 2023.
- D. W. Prather, S. Shi, G. J. Schneider, X.-F. Qi, C. Schuetz, J. A. Murakowski, “Simultaneous multi-band, multi-beam, and multi-function TX/RX phased array systems”, IEEE International Symposium on Phased Array Systems & Technology (PhAST), 2022.
- S. P. Nelan, A. Mercante, S. Shi, P. Yao, E. Shahid, B. Shopp, C. D. Hurley, M. Zablocki, D. W. Prather, “Ultra-high extinction dual-output thin-film lithium niobate intensity modulator”, IEEE Access, vol. 10, PP. 100300-100311, 2022.
- S. P. Nelan, A. Mercante, S. Shi, P. Yao, E. Shahid, B. Shopp, D. W. Prather, “Integrated lithium niobate intensity modulator on a silicon handle with slow-wave electrodes”, IEEE Photonics Technology Letters, vol. 34(18), pp.981-984, 2022.
- D. W. Prather, G. J. Schneider, S. Shi, J. A. Murakowski, C. Schuetz, and T. Creazzo, “Multifunctional, High Beam-Bandwidth Product Phased Array System,” Government Microcircuit Applications and Critical Technology GOMAC Tech, July 2022.
- X. Zhu, S. P. Nelan, A. Mercante, B. Shopp, P. Yao, S. Shi, D. W. Prather, “Phase modulation using a titanium dioxide strip on lithium niobate”, Optical Materials Express, vol. 12(8), pp.3296-3302, 2022.
- W. L. Beardell, G. J. Schneider, J. A. Murakowski, D. W. Prather, “Progress toward instantaneous microwave photonic spatial-spectral localization”, Terahertz, RF, Millimeter, and Submillimeter-Wave, Vol. 12000, pp.48-56, 2022.
- J. A. Murakowski, G. J. Schneider, and D. W. Prather, “Optical Processing for Phased-Array and Beamspace Mapping,” SPIE Photonics West, OPTO PW-220, January 2022.
- H. West and D. W. Prather, “Fiber-based arrayed waveguide grating for spectral sensing,” SPIE Photonics West, OPTO PW-220, January 2022.
- X. Zhu, A.J. Mercante, S. Shi, Y. Peng and D. W. Prather, “Low loss titanium dioxide strip loaded waveguide on thin-film lithium niobate at 1550nm,” SPIE Photonics West, OPTO PW-220, January 2022.
- V. A. Carey, M. R. Konkol, C. E. Harrity, E. L. Shahid, C. A. Schuetz, P. Yao, D. W. Prather, “W-band pulse generation using phase-locked lasers and high-power photodiode”, IEEE Photonics Technology Letters, vol. 34(12), pp.645-648, 2022.
- P. Yin, V. A. Carey, T. Creazzo, P. Yao, M. R. Konkol, D. W. Prather, and S. Preble, “Hybrid Integration Method for III-V Photodiode Using Bi-Layer Silicon Nitride Grating Coupler,” submitted for review, Opt. Express, 2022.
- S. Nelan, A. Mercante, C. Hurley, S. Shi, P. Yao, B. Shopp, and D. W. Prather, “Compact thin film lithium niobate folded intensity modulator using a waveguide crossing,” Opt. Express 30, pp. 9193-9207, 2022.
- X. Zhu, S. Nelan, A. Mercante, S. Shi, P. Yao, B. Shopp, and D. W. Prather, “Phase modulation using titanium dioxide strip on lithium niobate,” Optical Materials Express, Vol. 12, No. 8, pp. 3296-3302, 2022.
- W. Beardell, B. Mazur, C. Ryan, G. J. Schneider, J. A. Murakowski and D.W. Prather, “RF-Photonic Spatial-Spectral Channelizing Receiver,” Journal of Lightwave Technology, vol. 40, no. 2, pp. 432-441, 2022.
- V. A. Carey, M. R. Konkol, C. E. Harrity, E. L. Shahid, C. A. Schuetz, P. Yao, and D. W. Prather, “W-Band Pulse Generation Using Phase-Locked Lasers and High- Power Photodiode,” IEEE Photon. Technol. Lett., Vol. 34, No. 12, pp. 645-648, 2022.
- D. W. Prather, C. A. Schuetz, S. Shi, and G. Schneider, “RF Analog Imaging for Dual Multi-Static Radar and Radar Warning Receivers,” Military Sensing Symposia, Tri-Service Radar Symposium, July 2022.
- T. Gu, D. W. Prather, “Space Test of Photonic Integrated Materials and Devices,” IEEE Research and Applications of Photonics in Defense Conference (RAPID), September 2021.
- A. N. R. Ahmed, S. Shi, S. Nelan, A. J. Mercante, P. Yao and D. W. Prather, “Low-Voltage Modulators Using Thin-Film Lithium Niobate,” SPIE Photonics West, OPTO OE-116, January, 2020.
Patents Issued and Pending Continuing Applications
- C. Schuetz, J. Murakowski, G. Schneider, S. Shi and D.W. Prather, “Phased-Array Radio Frequency Receiver and Methods of Operation,” U.S. Patent Continuation Application US 2023/0420821 A1 (December 28, 2023).
- G. Schneider, C. Schuetz, J. Murakowski, T. Dillon, S. Shi, and D.W. Prather, “Arrays of lens-coupled single-mode optical fibers for capturing radio-frequency signals in an imaging phased-array receiver,” U.S. Patent Number 11,784,406 B2 (October 10, 2023).
- V. Carey, C. Harrity, E. Shahid, M. Konkol, C. Schuetz, P. Yao, D.W. Prather, “Pulsed RF Generator, Pulsed RF Transmitter and Related Methods of Operation,” U.S. Patent Continuation Application US 2023/0291167 A1 (September 14, 2023).
- S. Shi, D.W. Prather, J. Murakowski, and M. Konkol, “Beam steering antenna transmitter, multi-user antenna MIMO transmitter and related methods of communication,” U.S. Patent Number 11,721,896 B2 (August 8, 2023).
- C. Schuetz, J. Murakowski, G. Schneider, S. Shi and D.W. Prather, “Phased-Array Radio Frequency Receiver,” U.S. Patent Number 11,515,945 B2 (November 29, 2022).
- S. Galli, M. Kermalli, X. Qi, S. Shi, D.W. Prather, J. Murakowski, and G. Schneider, “Apparatus and Methods for Receiving Signals Using Optical Lens as a Beamformer,” U.S. Patent Continuation Application US 2022/0094374 A1 (May 26, 2022).
- S. Shi, D.W. Prather, J. Murakowski, and M. Konkol, “Beam Steering Antenna Transmitter, Multi-User Antenna MIOM Transmitter and Related Methods of Communication,” U.S. Patent Number 11,152,700 B2 (October 19, 20210.
- D.W. Prather, “Tunable optical pair source and related systems and methods,” U.S. Patent Continuation Application US 2021/0234338 A1 (July 29, 2021).
- D.W. Prather, “Tunable optical pair source and related systems and methods,” U.S. Patent Number US 10,965,100 B2 (March 30, 2021).
- S. Shi and D.W. Prather, “Modular Antenna Systems and Related Methods of Manufacture,” U.S. Patent Continuing Application US 2021/0273329 A1 (September 2, 2021).
- S. Shi and D.W. Prather, “Modular Antenna Systems and Related Methods of Manufacture,” U.S. Patent Number 11,031,690 B2 (June 8, 2021).
- S. Shi, D.W. Prather, P. Yao, and J. Murakowski, “Two-Dimensional Conformal Optically-Fed Phased Array and Methods of Manufacturing the Same,” U.S. Patent Number 10,908,499 B2 (February 2, 2021).
- S. Shi, J. Bai, C. Schuetz, G. Schneider, and D.W. Prather, “Optically fed antenna and optically fed antenna array,” U.S. Patent Number 11,069,974 B2 (2021).
- T. Dillon, C. Schuetz, and D.W. Prather, “Frequency agile microwave radiometer, hyperspectral microwave radiometer and methods of operation,” U.S. Patent Number 10,917,178 (2021).
- J. Murakowski, D.W. Prather, and P. Yao, “Phased-array antenna with in-plane optical feed and method of manufacture,” U.S. Patent Number 10,573,972 B2 (February 25, 2020).
- Y. Zhang, S. Shi, R. Martin, and D.W. Prather, “Slot coupled directional coupler and directional filters in multilayer substrates,” U.S. Patent Number 10,396,421 (2019).
- J. Russell, D.W. Prather, and C. Schuetz, “Systems and methods for intrusion detection using GHz beams,” U.S. Patent Number 10,055,959 (2018).
- C. Schuetz, J. Murakowski, G. Schneider, S. Shi, and D.W. Prather, “Phased-array radio receiver,” U.S. Patent Number 9,800,346 (2017).
- J. Murakowski, S. Shi, D. W. Prather,” Method of fabricating an optical grating,” U.S. Patent number 9,817,164 (2017).
- A. Sharkawy, D. W Prather, M. J. Zablocki,” Optical router having optical routing nodes of four bi-directional optical switches,” U.S. Patent number 9,817,296 (2017).
- S. Shi, J. Bai, and D.W. Prather, “Optical feed network for phased array antennas,” U.S. Patent number 9,614,280 (2017).
- J. Murakowski, G. Schneider, S. Shi, C. A Schuetz, Dennis W Prather, “Three-dimensional reconstruction of a millimeter-wave scene by optical up-conversion and cross-correlation detection,” U.S. Patent number 9,544,510 (2017).
- C. Schuetz, J. Murakowski, G. Schneider, S. Shi, Dennis W Prather, “Phased-array radio frequency receiver,” U.S. Patent number 9,525,489 (2016).
- A. Sharkawy, D.W. Prather, M. J. Zablocki, “Optical router using interconnected photonic crystal elements with specific lattice-hole geometry,” U.S. Patent number 9,459,404 (2016).
- J. Murakowski, G. Schneider, C. A. Schuetz, D. W. Prather, “Recycled carrier modulation in compound resonator configurations,” US Patent Number 9,287,990 (2016).
- R. D. Martin, C. A. Schuetz, D. W. Prather, T. E. Dillon, “Coherence Switching,” US Patent Number 9,297,702 (2016).
- D. W. Prather, G. Schneider, J. Murakowski, “High Spectral-Purity Carrier Wave Generated by Nonlinear Optical Mixing,” U.S. Patent Number 8,848,752 (2014).
- M. J. Zablocki, A. Sharkawy, and D.W. Prather, “Transfer method for thin film nanomembrane structures” U.S. Patent number 8,338,268 (2012).
- R. D. Martin, C. A. Schuetz, D. W. Prather, T. E. Dillon, “Controlling the phase of optical carriers,” US Patent Number 8,159,737 (2012).
- C. Schuetz, R. Martin, D. W. Prather, and T. Dillon, “Method for controlling the phase of optical carriers in millimeter wave imaging systems using optical upconversion: U.S. Patent number 7,965,435 (2011).
- P. Yao, D.W. Prather,” Method for making three-dimensional structures on a substrate having micron dimensions, and an article of manufacture three-dimensional objects on a substrate with micron dimensions,” U.S. Patent number 7,892,710 (2011).
- D.W. Prather, Z. Lu, J. Murakowski, S. Shi, G. Schneider, “Electromagnetic/optical tweezers using a full 3D negative-refraction flat lens” U.S. Patent number 7,718,953 (2010).
- J. Murakowski, G. Schneider, D.W. Prather” Fabrication of quantum dots embedded in three-dimensional photonic crystal lattice” U.S. Patent number 7,700,936 (2010).
- G. Schneider, J. Murakowski, E. Wetzel, and D.W. Prather” Zero-alignment method for tunable fabrication of three-dimensional photonic crystal by multiple-exposure laser interference using diffraction gratings patterned on a single mask” U.S. Patent number 7,704,644 (2010).
- Z. Lu, and D.W. Prather, “Optical coupler for coupling an optical fiber into a waveguide,” U.S. Patent number 7,428,358 (2008).
- D. W. Prather, A. Sharkawy, S. Shi, and R. A. Soref, “Electro-optical switching using coupled photonic crystal waveguides,” US Patent Number 7,428,348 (2008).
- J. Murakowski and D. W. Prather, “Method for fabricating optical devices in photonic crystal structures,” US Patent Number 7,384,724 (2008).
- J. Kolodzey, T. N. Adam, D. W. Prather, “Terahertz frequency band wavelength selector,” US Patent Number 7,382,032 (2008).
- J. R. Humphrey, J. P. Durbano, F. E. Ortiz, and D.W. Prather, “Organization of Cache Memory for Hardware Acceleration of the Finite-Difference Time-Domain Method,” U.S. Patent number 7,337,265 (2008).
- J. P. Durbano, J. R. Humphrey, F. E. Ortiz, D.W. Prather, and M. S. Mirotznik, “Reformulation of the Finite-Difference Time-Domain Algorithm for Hardware-Based Accelerators,” U.S. Patent number 7,340,695 (2008).
- J. R. Humphrey, J. P. Durbano, and D.W. Prather, “Hardware Implementation of the Pseudo-Spectral Time-Domain Method,” U.S. Patent number 7,295,939 (2007).
- J. P. Durbano, and D.W. Prather “Hardware-based accelerator for time-domain scientific computing,” U.S. Patent number 7,194,497 (2007).
- D.W. Prather, J. Murakowski, “Process for making photonic crystal circuits using an electron beam and ultraviolet lithography combination.” U.S. Patent number 7,255,804, (2007).
- J. Murakowski, D. Pustai, D.W. Prather, “Etchless fabrication of planar photonic crystal structures in high refractive index material.” U.S. Patent number 7,157,296 (2007).
- S. Lohokare and D.W. Prather, “Antimonide-based optical devices.” U.S. Patent number 7,170,096 (2007).
- J. Kolodzey, T. N. Adam and D.W. Prather, “Terahertz frequency band wavelength selector.” U.S. Patent number 7,057,250 (2006).
- D.W. Prather and S. Lohokare, “Method for creating flip-chip conductive-polymer bumps using photolithography and polishing.” U.S. Patent number 7,109,107 (2006).
- G. P. Behrmann, D. W. Prather, “Fiber Bragg grating compression sensor system,” US Patent Number 7,050,662 (2006).
- D.W. Prather, A. S. Sharkawy, and S. Shi “Multi-channel wavelength division multiplexing using photonic crystals” U.S. Patent number 6,891,993 (2005).
- D.W. Prather, A. S. Sharkawy, and S. Shi “Hetero-Structure Photonic Bandgap Materials” U.S. Patent number 6,832,033, (2004).
- S. Shi, C. Chen, A. S. Sharkawy and D.W. Prather, “System for efficient coupling to photonic crystal waveguides” U.S. Patent number 6,782,169, (2004).
- J. Murakowski and D.W. Prather, “Micro-Ring Cavity Gyroscope with Magnetic Field lock-in Minimization,” U.S. Patent number 6,603,558, (2003).
- H. L. Levitt, E. Gill, and D.W. Prather, “Efficient Spatial Image Separator,” U.S. Patent number 6,061,135, (2000).
The Center for Wireless Intelligent Systems Engineering at the University of Delaware
(UD-WiSE) is a research center within the Department of Electrical and Computer Engineering.
research activities
- Fabricate Devices and Test Subsystems
- Design and Validate Algorithms
- Analyze and Simulate Network Performance
- Specify, Design and Integrate Demo Platform
UNIVERSITY of DELAWARE
Department of Electrical and Computer Engineering
140 Evans Hall
Newark, DE 19716
P: (302) 831-2405
F: (302) 831-4375
E: ece-info@udel.edu