Publications                                                                  

Referred Journal Papers

  1. F. Taghian, V. Ahmadi, and  L. Yousefi, " Enhanced Thin Solar Cells Using Optical Nano-Antenna Induced Hybrid Plasmonic Travelling-Wave, "accepted for publication in the IEEE Journal of Ligth Wave Technology.

  2. B. Ashrafi-Nia, L. Yousefi, and M. Shahabadi, " Integrated Optical Phased Array Nano-Antenna System using a Plasmonic Rotman Lens, "accepted for publication in the IEEE Journal of Ligth Wave Technology.

  3. M. A. Panahi, L. Yousefi, and M. Shahabadi, "Highly Directive Hybrid Plasmonic Leaky-Wave Optical Antenna with Controlled Side-Lobe Level" , IEEE Journal of Ligth Wave Technology, vol. 33, no. 23, pp. 4791-4798, Dec. 2015.

  4. M. Shoaei, M. Moravvej-Farshi, and L. Yousefi, "All-optical switching of nonlinear hyperbolic metamaterials in visible and near-infrared regions," Journal of Optical Society of America B (JOSA-B), vol. 32, No. 11, pp. 2358-2365, Nov. 2015.

  5. M. Yarahmadi, M. Moravvej-Farshi, and L. Yousefi, " Subwavelength graphene-based plasmonic THz switches and logic gates," IEEE Transactions on THz Science and Technology, vol. 5, pp. 725-731, Sep. 2015.

  6. M. Faraji, M. Moravvej-Farshi, and L. Yousefi, " Tunable THz perfect absorber using graphene-based metamaterials," Optics Communication (Elsevier), Vol. 355, pp. 352-355, July 2015.

  7.  M. Shoaei, M. Moravvej-Farshi, and L. Yousefi, "Nanostructured graphene-based hyperbolic metamaterial performing as a wide-angle near infrared electro-optical switch," Applied Optics, Vol. 54, pp. 1206-1211 , Feb. 2015.

  8. L. Yousefi, “Highly Directive Hybrid Plasmonic Leaky Wave Optical Nano-Antenna,” Progress In Electromagnetics Research Letters, Vol. 50, pp. 85-90, Dec. 2014.
  9. M.  M. Bait-Suwailam, L. Yousefi, B.  Alavikia, and O. M. Ramahi, "Analytical Models for Predicting the Effective Permittivity of Complementary Metamaterial Structures",  Microwave and Optical Technology Letters, Vol. 55, No. 7, July 2013. (full text).

  10. L. Yousefi, and A. C. Foster, "Waveguide-fed optical hybrid plasmonic patch nano-antenna," Optics Express, Vol. 20, No. 16, July 2012 (full text)

  11. L. Yousefi, M. S. Boybay, and O. M. Ramahi, "Characterization of Metamaterials using a Strip Line Fixture", IEEE Transactions on Antennas and Propagation, vol. 59, no. 4, pp. 1245-1253, April 2011 (full text).

  12. H. Attia, L. Yousefi, and O. M. Ramahi, "High gain patch antennas loaded with high characteristic impedance superstrates", IEEE Antennas and Wireless Propagation Letters, vol. 10, pp. 858-861, Auguest 2011. (full text)

  13. H. Attia, L. Yousefi, and O. M. Ramahi, " Analytical Model for Calculating the Radiation Field of Microstrip Antennas With Artificial Magnetic Superstrates: Theory and Experiment", IEEE Transactions on Antennas and Propagation, vol. 59, no. 5, pp. 1438-1445, May 2011. (full text).

  14. H. Attia, L. Yousefi, O. Siddiqui and O. M. Ramahi, "Analytical Formulation of the Radiation Field of Printed Antennas in the Presence of Artificial Magnetic Superstrates,", Journal of Applied Physics A, Special issue on Advances in Metamaterials and Photonics, Dec. 2010. (full text).

  15. L. Yousefi, and O. M. Ramahi, "Artificial Magnetic Materials Using Fractal Hilbert Curves," IEEE Transactions on Antennas and Propagation, vol. 58, no. 8, pp. 2614 - 2622, Auguest 2010. (full text)

  16. A. Kabiri, L. Yousefi, and O. M. Ramahi, "On the fundamental limitations of artificial magnetic materials, " IEEE Transactions on Antennas and Propagation, vol. 58, no. 7, pp. 2345-2353, July 2010. (full text)

  17. L. Yousefi, and O. M. Ramahi, "Miniaturized antennas using artificial magnetic materials with fractal hilbert inclusions ", Electronic Letters, vol. 46, no. 12, pp. 816-817 , June 2010 (full text).

  18. H. Attia, L. Yousefi, M. M. Bait-Suwailam, M. S. Boybay, and O. M. Ramahi, "Enhanced gain microstrip antenna using engineered magnetic superstrates ", IEEE Antennas and Wireless Propagation Letters , vol.8, pp.1198-1201 , 2009. (full text)

  19. L. Yousefi, H. Attia , and O. M. Ramahi, " Broadband Experimental Characterization of Artificial Magnetic Materials based on a Microstrip Line Method, " Journal of Progress in Electromagnetic Research (PIERS) , Vol.90, pp. 1-13, February 2009. (full text)

  20. L. Yousefi, B. Mohajer-Iravani, and O. M. Ramahi, "Enhanced Bandwidth Artificial Magnetic Ground Plane for Low Profile Antennas", IEEE Antennas and Wireless Propagation Letters, Vol.6, pp. 289 - 292 , June 2007. (full text)

    Conference Papers:
    1. L. Yousefi, and A. C. Foster, " Waveguide-Fed optical plasmonic patch nano-antenna, " Proceeding of 2012 Frontiers in Optics/Laser Science meeting (FIO), Oct. 2012.

    2. M. M. Bait-Suwailam, L.Yousefi, and O. M. Ramahi, "Analytical Models for Artificial Complementary Resonators",  Proceeding of 2011 European Microwave Coference (EuMW 2011).

    3. H. Attia, L. Yousefi, and O. M. Ramahi, " High Gain Microstrip Antennas Loaded with High Characteristic Impedance Superstrates," Proceeding of IEEE Antennas and Propagation Society International Symposium, Spokane, Washington, USA, July 3-8, 2011.

    4. Hussein Attia, O. Siddiqui, L. Yousefi, and O. M. Ramahi, " Metamaterial for Gain Enhancement of Printed Antennas: Theory, Measurements and Optimization, " Proceeding of Saudi International Electronics, Communications and Photonics Conference, Riyadh, Saudi Arabia, April 23-26, 2011. (Invited)

    5. H. Attia, L. Yousefi, and O. M. Ramahi ," Theoretical and experimental investigation of patch antennas loaded with engineered magnetic superstrates, " proceeding of 2010 European Microwave Coference (EuMW 2010).

    6. L. Yousefi, M. S. Boybay, and O. M. Ramahi, "Experimental retrieval of the effective parameters of metamaterials using a strip line method,"  Proceeding of 2010 IEEE International Symposium on Antennas and Propagation, July 11-17, 2010.

    7. H. Attia, L. Yousefi, and O. M. Ramahi, "High-Gain low-profile antenna using artificial magnetic superstrates," accepted for presentation in 2010 IEEE International Symposium on Antennas and Propagation, July 11-17, 2010.

    8. H. Attia, L. Yousefi, O. Siddiqui, and O. M. Ramahi, "Analytical formulation of the radiation field of printed antennas in the presence of artificial magnetic superstrates", Proceeding of the 2nd International Conference on Metamaterials, Photonic Crystals and Plasmonics, Feb. 2010, Egypt.

    9. O. M. Ramahi, M. S. Boybay, O. Siddiqui, L. Yousefi, A. Kabiri, H. Attia, M. Bait-Suwailam and Z. Ren, “Metamaterials: An Enabling Technology for Wireless Communications,” Proceeding of International Conference on Communication Technologies ICCT2010, Riyadh, Saudi Arabia, Jan. 18-20, 2010 (Invited and keynote presentation).

    10. L. Yousefi, and O. M. Ramhi " Experimental Retrieval of the Effective Parameters of Artificial Magnetic Materials based on a Microstrip Line Method, " Proceeding of IEEE Symposium on Antenna and Propagation (APS 2008), July 2008.

    11. A. Kabiri, L. Yousefi, and O. M. Ramhi " Magnetic Loss Tangent Optimization in Design of Artificial Magnetic Slabs,", Proceeding of IEEE Symposium on Antenna and Propagation (APS 2008), July 2008.

    12. A. Kabiri, L. Yousefi, and O. M. Ramhi , "On the Fundamental Limitations of Artificial Magnetic Material," Proceeding of NATO Advanced Research Workshop in Morocco, May 2008.

    13. A. Kabiri, L. Yousefi, and O. M. Ramahi "Circuit-based model for artificial magnetic materials" Proceeding of 2008 Iranian Conference on Electrical Engineering , May 2008.

    14. L. Yousefi, and O. M. Ramhi, " Miniaturized Enhanced Bandwidth Antenna using Engineered Magnetic Materials with Multi-resonator Configurations", Proceeding of IEEE Symposium on Antenna and Propagation (APS 2007), pp. 1885-1888, June 2007.

    15. L. Yousefi, and O. M. Ramahi, "Engineered Magnetic Materials with Improved Dispersion Using Multi-Resonator Structures," Proceeding of 2007 IEEE Canadian Conference on Electrical and Computer Engineering, pp. 966-969, April 2007.

    16. L. Yousefi, and O. M. Ramahi, "New Artificial Magnetic Materials Based on Fractal Hilbert Curves", Proceeding of  2007 IEEE International Workshop on Antenna Technology: Small and Smart Antennas and novel Metamaterials, pp. 237-240, March 2007.

    17. L. Yousefi, B. Mohajer-Iravani, and O. M. Ramahi, "Low Profile Wide Band Antennas using Electromagnetic Bandgap Structures with Magneto-Dielectric Materials", Proceeding of 2007 IEEE International Workshop on Antenna Technology: Small and Smart Antennas and novel Metamaterials , pp. 431-434, March 2007.

    18. L.Yousefi, and Ali Banai " Design and Fabrication of a Programmable Delta-Sigma Fractional-N Synthesizer," Proceeding  of 2005 Iranian Conference on Electrical Engineering ", May 2005.

    19. L. Yousefi, and A. Banai, " 1.1-1.3 GHz Fractional Delta-Sigma Synthesizer using FPGA," URSI 2005, pp. 118, June 2005.