Wave Engineering through
eXtreme & Intelligent matTEr

 ​​​​​​​​​​​​​​​​​​​​​​​Journal Publications

  1. Roshdy M.Bilal O. R.,
    "Observation of Ferroelectric Programmability in 3D Printed Metamaterials"
    Advanced Materials Technologies, Accepted, 2024. 

  2. Samak M M., Bilal O. R.,
    "Evidence of zero group velocity at the lowest dispersion branch through local interactions"​
    ​APL Materials, 12, 1, 2024.

  3. Kheybari M.Bilal O. R.,
    "Harnessing asymmetry to reprogram nonlinear metamaterials on-the-fly with no moving parts"
    Materials & Design, 233,112168, 2023. 

  4. Chorsi M., Le T., Lin F., Vinikoor T., Das R., Stevens J., Mundrane C., ...,Morales M., Bilal O. R., Kazerounian K., Ilies H., Nguyen T.
    "Highly piezoelectric, biodegradable, and flexible amino acid nanofibers for medical applications"
    Science Advances,  9, 24, 2023.

  5. Roshdy M.,  Chen T., Nakhmanson S., Bilal O. R.,
    "Tunable ferroelectric auxetic metamaterials for guiding elastic waves in three-dimensions"
    Extreme Mechanics Letters, 59, 101966, 2023.

  6. Krushynska A. O., Torrent D., Aragón A. M., Ardito R. , Bilal O. R., ...
    "Emerging topics in nanophononics and elastic, acoustic, and mechanical metamaterials: An overview"

    Nanophotonics, 0671, 2023. [PDF]

  7. Mazzotti M.,  Foehr A.,  Bilal O. R., Bergamini A., Bosia F, Daraio C., Pugno NM, Miniaci M 
    "Bio-inspired non self-similar hierarchical elastic metamaterials"
    International Journal of Mechanical Sciences, 241, 107915, 2023.​

  8. Eichelberg A.Watkins A. A., Bilal O.R., 
    "Metamaterials with reprogrammable reciprocity"
    Physical Review Applied, 18, 054049, 2022.

  9. Kheybari M., Daraio C., Bilal O. R.,
    "Tunable auxetic metamaterials for simultaneous attenuation of airborne sound and elastic vibrations in all directions"
    Applied Physics Letters, 121, 081702, 2022. (Editor's pick

  10. Kheybari M., Wang Z., Xu H., Bilal O. R.,
    "Programmability of ultrathin metasurfaces through curvature"
    Extreme Mechanics Letters, 101620, 2022.

  11. Watkins A. A.Eichelberg A.Bilal O. R.,
    "Harnessing re-programmable phase transitions to control the propagation of sound waves"
    Physical Review Applied, 17.2, 024036, 2022. (Editor's choice

  12. Le T., Curry E., Vinikoor T., Das R., Liu Y., Sheets D., Tran K., Hawxhurst C., Stevens J., Hancock J., Bilal O.R., Shor L.M, Nguyen T.D. "Piezoelectric Nanofiber Membrane for Reusable, Stable, and Highly Functional Face Mask Filter with Long-Term Biodegradability"
    Advanced Functional Materials, 2113040, 2022.

  13. Watkins A. A.*, Eichelberg A.*, Bilal O. R.,
    "Exploiting Localized Transition Waves to Tune Sound Propagation in Soft Materials". *equal contribution​
    Physical Review B, 104, L140101, 2021. 

  14. Norouzi E.*, Watkins A. A.*, Bilal O. R.,
    "Classification of emerging patterns in self-assembled two-dimensional magnetic lattices". *equal contribution
    Physical Review E, 104, 044902, 2021. [PDF]

  15. Bilal O.R., Yee C. H., Rys J., Schumacher C., Daraio C.,
    "Experimental realization of phonon demultiplexing in three-dimensions"
    Applied Physics Letters, 118, 091901, 2021. 

  16.  Watkins ​​A. A.Bilal O. R.,
    ​"Demultiplexing infrasound phonons with tunable magnetic lattices"
    Frontiers in Materials, 7, 410, 2020 (invited paper: Rising Stars 2020). 

  17. Bilal O. R., Costanza V., Israr A.,  Palermo A.,  Celli P., Lau F., Daraio C.,
    "A flexible metasurface as a versatile haptic interface".
    Advanced Materials Technologies, 2000181, 2020.

  18. Bilal O. R., Foehr A., Daraio C.,
    "Enhancement of deep-subwavelength band gaps in flat spiral-based phononic metamaterials using the trampoline phenomena".
    Journal of Applied Mechanics, 87, 7, 2020. 

  19. Chen T., Bilal O.R., Lang R., Daraio C. and Shea K., 
    "Autonomous deployment of a solar panel using an elastic origami and distributed shape memory polymer actuators".
    Physical Review Applied, 11, 064069, 2019. 

  20. Bilal O.R., Ballagi D. and Daraio C., 
    "Architected lattices for simultaneous broadband attenuation of airborne sound and mechanical vibrations in all directions". 
    Physical Review Applied,10, 054060, 2018. 

  21. Bilal O.R.*, Chen T.*, Shea K. and Daraio C., 
    "Harnessing bistability for directional propulsion of untethered, soft robots". *equal contribution
    Proceedings of the National Academy of Sciences, PNAS, 115 (22), 5698-5702, 2018.

  22. Bilal O.R.*, Foehr A.*, Huber S.D, Daraio C., 
    "Spiral-based phononic plates: From wave beaming to topological insulators. *equal contribution
    Physical Review Letters, 120, 205501, 2018. 

  23. Serra-Garcia M., Peri V., Süsstrunk R., Bilal O. R., Larsen T., Villanueva G. and Huber S.,
    "Observation of a phononic quadrupole topological insulator",
    Nature, 555, 342–345, 2018.  

  24. Bauhofer A., Krödel S.,  Rys J., Bilal O. R.,  Constantinescu A. and Daraio C., 
    "​Harnessing Photochemical Shrinkage in Direct Laser Writing for Shape Morphing of Polymer Sheets",
    Advanced Materials, 29 (42) 2017.

  25. Bilal O. R., Foehr A., Daraio C.,
    "Observation of trampoline phenomena in 3D-printed metamaterial plates", 
    Extreme Mechanics Letters, 15, 103-107, 2017.

  26. Bilal O. R., Foehr A., Daraio C.,
    "Reprogrammable phononic metasurfaces", 
    Advanced Materials, 29 (38), 201700628, 2017.

  27. Bilal O. R., Foehr A., Daraio C.,
    "Bistable metamaterial for switching and amplifying elastic vibrations",
    Proceedings of the National Academy of Sciences, PNAS 114 (18) 4603-4606, 2017.

  28. Bilal O. R., Süsstrunk R., Daraio C., Huber S. D,
    "Intrinsically polar elastic metamaterils",
    Advanced Materials, 29 (26), 1700540, 2017.

  29. Frandsen N. M., Bilal O. R., Jensen J. S. and Hussein M. I.,
    "Inertial amplification of continuous structures: Large band gaps from small masses",
    Journal of Applied Physics, 119 (12), 124902, 2016.

  30. Hussein M. I., Biringen S., Bilal O. R. and Kucala A.,
    "Flow Stabilization by Subsurface Phonons", 
    Proceedings of the Royal Society A, 471, 20140928, 2015.

  31. Bilal O. R. and Hussein M. I.,
    "Trampoline Metamaterial: Local Resonance Enhancement by Springboards", 
    Applied Physics Letters, 103, 111901, 2013.

  32. Bilal O. R. and Hussein M. I.,
    "Ultrawide Phononic Band Gap for Combined In-plane and Out-of-plane Waves",
    Physical Review E, 84, 065701(R), 2011.

Book Chapter

  • Bilal O. R. and Hussein M. I.,
    "Chapter 10: Topology Optimization of Lattice Materials",
    Dynamics of Lattice Materials, Wiley, 2017.


  1. ​"Haptic Devices Using Structured Metasurfaces"
    Bilal O. R.,  V. Costanza, Daraio C. A. Israr and F. Lau,
    U.S. Patent 15/955,446, Filed 4/17/2018.​​

  2. ​​"Reprogrammable Phononic Metasurfaces" 
    Bilal O. R., Daraio C. and Foehr A., 
    U.S. Patent 15/955,441, Filed 4/17/2018.​​

  3. "Acoustic Transistors and Acoustic Computations" 
    Bilal O. R., Daraio C. and Foehr A.,
    U.S. Provisional Application, CIT File No: 7816-P, Filed 6/30/2017.

  4. "Phononic Materials Used to Control Flow Behavior" 
    Hussein M. I., Biringen S., Bilal O. R. and Kucala A.,
    US Patent 20,160,097,410, 2016.


  • Hussein M. I., Torrent D., Bilal O. R.
    Special issue on “Frontiers of Mechanical Metamaterials”
    Extreme Mechanics Letters, 12:1, 2017. 

Refereed Conference Proceedings (full papers)

  1. Bilal O. R., El-Beltagy, M.A. and Hussein, M.I., (Invited Paper)
    "Topologically Evolved PhoTonic Crystals: Breaking the World Record in Band Gap Size,", 
    Proceedings of SPIE Smart Structures/NDE Conference on Smart Sensor Phenomena, Technology, Networks, and Systems Integration V (Conference SSN08), vol.  8346, 834609, pp. 1-5, San Diego, California, 11-15 March 2012.

  2. Bilal O. R. and Hussein, M.I., (Invited Paper)
    "Topologically Evolved PhoNonic Material: Breaking the World Record in Band Gap Size,",
    Photonic and Phononic Properties of Engineering Nanostructures II (Conference 8269), Nanotechnologies Track, Proceedings of SPIE  Photonics West, vol. 8269, 826911, pp. 1-7, San Francisco, California, 21-26 January 2012.

  3. Guo Q., Bilal O. R. and Hussein, M.I.,
    "A Fast Method for Electronic Band Structure Calculations,"
    Proceedings of 2011 ASME International Mechanical Engineering Congress and R&D Expo, IMECE2011-65681, [CD ROM: pp. 1- 5], Denver, Colorado, 11-17 November 2011.

  4. Bilal O. R. and Hussein, M.I.,
    "Optimization of Phononic Crystals for the Simultaneous Attenuation of Out-of-Plane and In-Plane Waves,"
    Proceedings of 2011 ASME International Mechanical Engineering Congress and R&D Expo (Denver, Colorado, 11-17 November 2011), Paper no. IMECE2011-65665, pp. 969-972, 2011.

  5. Bilal O. R., El-Beltagy, M.A. and Hussein, M.I.,
    "Optimal Design of Periodic Timoshenko Beams using Genetic Algorithms,"
    Proceedings of the 52nd AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference (AIAA SDM 52nd),  [CD ROM: pp. 1- 9], Denver, Colorado, 4-7 April 2011. 

  6. Bilal O. R., El-Beltagy, M.A., Rasmy, M.H. and Hussein, M.I.,
    "The Effect of Symmetry on the Optimal Design of Two-Dimensional Periodic Materials,"
    Proceedings of the Seventh International Conference on Informatics and Systems (INFOS’10), [CD ROM: pp. 1- 7], Cairo, Egypt, 28-30 March 2010.