I am a postdoctoral researcher at the Department of Electrical and Systems Engineering, University of Pennsylvania, working with Prof. Nader Engheta. I received B.Sc. and M.Sc. degrees in electrical engineering from the University of Tehran, Iran, and the Ph.D. degree in electrical engineering from The University of Texas at Austin, Austin, Texas, in 2016. During my PhD, I have been member of the Metamaterials and Plasmonics Research Laboratory working with Prof. Andrea Alu, and have been affiliated with The Wireless Networking and Communications Group (WNCG) at UT-Asutin. Recent News March 2019: Our paper on using inverse-designed metamaterials to solve systems of linear equations is published in Science magazine, and covered by several news outlets including Penn Today, Phys.org, Science Daily, The Daily Pennsylvanian, COSMOS, The Naked Scientists, Physics world, Photonics.com, and Medium.  Photo taken by Eric Sucar, UPenn photographer. January 2019: I have been selected as one of Caltech's 2019 "Young Investigator Lecturers in Engineering and Applied Science." I will give a seminar in Caltech in March 2019 about my recent research works.  You can find the seminar flyer here:  October 2018: Check out the article by Nicholas Wang in the October issue of IEEE Photonics Society Newsletter on recent IPS Gradate Fellows. [Link]. August 21, 2018: Our paper entitled "Low-Threshold Lasing and Coherent Perfect Absorption in the Generalized PT-Symmetric Optical Structures," in collaboration with Prof. Chen's group at University of Illinois-Chicago, has been published in Physical Review Applied. [Link]  M. Sakhdari, N. Mohammadi Estakhri, H. Bagci, and P. Y. Chen, Physical Review Applied, Vol. 10, No. 2 (8 Pages) 024030, August 21, 2018. Copyright 2018 by the American Physical Society. July 2018: We have two contributions at the 2018 IEEE AP-S/URSI Symposium, Boston, MA: Title: Flat Optical Mach-Zehnder Interferometer based on Gradient Metasurfaces Session: Functional Material Platforms Enabling Exotic Scattering Phenomena Time: Wednesday, July 11, 09:00 - 09:20 Title: Wide Scan, Wideband Arrays with Self-Dual Point-Like Elements Session: Wideband and UWB Array Radiators Time: Tuesday, July 10, 16:00 - 17:40 June 22, 2018: I have been selected as a speaker at the upcoming Plasmonics and Nanophotonics Gordon Research Seminar. Few research abstracts are selected by the conference chair to be presented at this 1-day seminar. The focus of this meeting is on innovations in nanoscale light-matter interactions using plasmonic and resonant dielectric nanostructures, which enable and enhance applications in biomedical science, energy generation and storage, and quantum information technology. My talk entitled "Flat Optics: Ultra-Compact Optical Devices Enabled by Dielectric Metasurfaces".  June 11, 2018: I have been selected to participate in the "Rising Stars in EECS 2018" Workshop at MIT! This prestigious workshop identifies and mentors outstanding women in electrical engineers and computer scientists interested in exploring careers in academia. See more information here. I have also been selected as the "Rising star in EECS" in 2017 by Stanford University.  June 2018: I am attending the prestigious International Microwave Symposium (IMS 2018), with a contributed talk on "Wideband, Periodically Arranged Self-Dual Subwavelength Waveguides". This year IMS is held at Philadelphia convention center! May 2018: My advisor is giving a plenary talk at CLEO this year. If you attend CLEO, mark your calendars for his talk on Tuesday morning (May 15th). May 2018: I am attending the 2018 CLEO conference with two contributed presentations on Metasurface-based optical elements (poster presentation on Wednesday May 16th), and Mathematical equation solving with MZI networks (see Mario's talk on Friday May 18th). April 30, 2018: Our paper entitled "Enhanced Photoresponse in Metasurface-Integrated Organic Photodetectors," has been published in Nano Letters. [Link]  X. Xu, H. Kwon, B. Gawlik, N. Mohammadi Estakhri, A. Alù, S. V. Sreenivasan, and A. Dodabalapur, Nano Letters, Vol. 18, No. 6, pp. 3362-3367, April 30, 2018. Copyright 2018 by the American Chemical Society. April 30, 2018: Our paper in collaboration with colleagues at the UT-Austin ECE and ME departments, entitled "Enhanced Photoresponse in Metasurface-Integrated Organic Photodetectors," has been accepted for publication in Nano Letters. This work provides experimental evidence on practical applications of gradient metasurfaces for enhanced photodetection and solar energy conversion, proposed in my earlier works [Related publication can be found here]. April 2018: I have been selected to attend the prestigious “2018 Gordon Research Conference (GRC) on Plasmonics and Nanophotonics” and the associated “Gordon Research Seminar (GRS)” with my abstract entitled "Flat Optics: Ultra-compact Optical Devices Enabled by Dielectric Metasurfaces". March 2018: I received the "DMP Post-Doctoral Travel Award" to attend APS March meeting 2018, Los Angeles, CA. These awards are presented and funded through the APS Division of Materials Physics (DMP), through a very competitive process.  March 2018: I am attending the 2018 APS March meeting with a contributed talk on computational capabilities of EM waves. January 2018: Our review paper on "Recent progress in Gradient Metasurfaces" has been one of the most downloaded papers from The Journal of the Optical Society of America B, in January 2018.  January 2018: I am presenting two paper at the 2018 SPIE Photonics West on "near-field engineering" and "metamaterial-based equation solving". November 6, 2017: I am attending the "Rising Stars in EECS 2017" Workshop, at Stanford University, presenting my research on "Computational meta-platforms: Using light to solve mathematical equations". For event details see here. October 25, 2017: Invited seminar on "Wave-matter Interactions to Solve Integral Equations" at the Electrical and Computer Engineering Department, Wayne State University. August 4, 2017: I have been selected to participate in the "Rising Stars in EECS 2017" Workshop, at Stanford University! This workshop brings top graduate and postdoc women in EECS together for sci-entific discussions and informal sessions aimed at navigating the early stages of an academic career. See more information here.  July 10, 2017: I am presenting my work on metaplatforms for solving Integral Equations with waves at the IEEE AP-S/URSI Symposium, San Diego, CA. May 28, 2017: I received the International USNC-URSI Travel Grant 2017 to support the participation in the 32nd International Union of Radio Science General Assembly and Scientific Symposium in Montreal, Québec, Canada. May 18, 2017: I am presenting my recent works on solving Integral Equations with metamaterial structures at the CLEO conference, San Jose, CA.
April 28, 2017: Our paper in collaboration with colleagues at the UT-Austin physics department, entitled "Cascaded Exciton Energy Transfer in a Monolayer Semiconductor Lateral Heterostructure Assisted by Surface Plasmon Polariton," has been accepted for publication in Nature Commutations.
January 23, 2017: Our paper in collaboration with colleagues at AMOLF, entitled "Visible Light, Wide-Angle Graded Metasurface for Back Reflection" has been accepted for publication in ACS Photonics and published online.[Link]
 N. Mohammadi Estakhri, V. Neder, M. Knight, A. Polman, and A. Alu, ACS Photonics, Vol. 4, No. 2, pp 228-235, January 23, 2017. Copyright 2017 by the American Chemical Society.
November 15, 2016: Our paper entitled "Experimental Demonstration of Metasurface-Based Ultrathin Carpet Cloaks for Millimeter Waves" has been published in Advanced Optical Materials. [Link]
October 14, 2016: Our paper entitled "Wave-front Transformation with Gradient Metasurfaces" has been published in Physical Review X. [Link]
 N. Mohammadi Estakhri and Andrea Alu, Physical Review X, Vol. 6, No. 4, 041008 (17 pages), October 14, 2016. Copyright 2016 by the American Physical Society.
September 23, 2016: Our paper in collaboration with colleagues at Universidad Pública de Navarra, entitled "Experimental Demonstration of Metasurface-based Ultrathin Carpet Cloak for Millimetre Waves" has been accepted for publication in Advanced Optical Materials.
August 18, 2016: Our paper on fundamental limitations of passive metastases, entitled "Wave-front Transformation with Gradient Metasurfaces," has been accepted for publication in Physical Review X.
August 8, 2016: I joined Engheta group at Upenn!
 July 2016: I am presenting a poster at the Gordon Research Conference on Plasmonics and Nanophotonics: From Plasmonic Fundamentals to Nanooptical Applications in Sunday River Newry, ME. I will discuss my recent works on the unique scattering properties of parity-time symmetric nanoparticles.
June 2016: I have successfully defended my doctorate dissertation and obtained my PhD at the ECE department, University of Texas at Austin. My Dissertation entitled: Manipulating Light-Matter Interactions with Plasmonic Metamolecules and Metasurfaces: A Route to Control Absorption and Scattering at the Nanoscale.
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