This research line is mainly focused on the design and characterization of advanced micro- and nano-photonic devices based on plasmonic nanostructures and other complex electromagnetic structures. Plasmonic nanostructures are made of metals, and thus they allow for overcoming the diffraction limit and achieving light manipulation at subwavelength scales. Our final goal is to implement plasmonic micro- and nano-structures on silicon photonics circuits, therefore making use of the fabrication facilities available at NTC.


But not only plasmonic nanostructures can improve the performance of current state-of-the-art silicon photonic chips. Recently, optomechanics has revealed itself as a research hot-topic since it provides adequate mechanisms to make light and sound interact at the nanoscale. In our group, we deal with optomechanical cavities built on silicon chips to manipulate GHz vibrations optically with the final aim of getting ultra-compact microwave photonic circuitry on silicon.

The new research line in the process of consolidation is the development of graphene on non-catalytic substrates for hybrid silicon-graphene photonics. A key challenge to address is to develop wafer scale growth, transfer and nanofabrication protocols providing high mobility devices (over 5,000 cm2V-1s-1) with device-to-device reproducibility and high throughput. We are developing a flow for the integration of monocrystalline graphene in photonics circuits, either by a growth-transfer or by a direct-growth approach. We are focused on the growth of graphene on technologically relevant substrates, mainly sapphire, silicon-on-insulator (SOI), and germanium.

We are convinced that the integration of plasmonic and optomechanical components as well as graphene onto silicon-photonics chips is a key step towards future nanophotonic chips, which is a goal pursued in our research line. Envisaged applications include all-optical signal processing, microwave photonics, nanospectroscopy, and chemo-bio-sensing.

  1. Experimental observation of higher-order anapoles in individual silicon disks under in-plane illumination


  2. Enhanced excitation and readout of plasmonic cavity modes in NPoM via SiN waveguides for on-chip SERS

    J. E. Vázquez-Lozano, J. J. Baumberg, and A. Martínez

    Optics Express, Vol. 30, pp. 4553-4563, 2022.


  3. Room-temperature silicon platform for GHz-frequency nano-electro-opto-mechanical systems

    D. Navarro-Urrios, M. F. Colombano, G. Arregui, G. Madiot, A. Pitanti, A. Griol, T. Makkonen, J. Ahopelto, C. M. Sotomayor-Torres and A. Martínez

    ACS Photonics, vol. 9, pp. 413-419, 2022.


  4. Testing Optomechanical Microwave Oscillators for SATCOM Application

    Laura Mercadé , Eloy Rico , Jesús Ruiz Garnica , Juan Carlos Gómez , Amadeu Griol , Miguel A. Piqueras, Alejandro Martínez, and Vanessa C. Duarte

    Journal of Lightwave Technology, vol. 40, pp. 4539-4547, 2022.


  5. Thermal Properties of Nanocrystalline Silicon Nanobeams

    J. Maire, E. Chavez-Angel, G. Arregui, M. F. Colombano, N. E. Capuj, A. Griol, A. Martínez, D. Navarro-Urrios, J. Ahopelto, C. M. Sotomayor-Torres 

    Advanced Functional Materials, Vol. 32, 2105767, 2022. 


  6. Photonic Bandgap Closure and Metamaterial Behavior in 1D Periodic Chains of High-Index Nanobricks

    Evelyn Díaz-Escobar, Laura Mercadé, Ángela I. Barreda, Jaime García-Rupérez, and Alejandro Martínez

    Photonics 9(10), 691, 2022. 


  7. Hybrid photonic-plasmonic cavity design for very large Purcell factors at telecom wavelengths

    Ángela Barreda, Laura Mercadé, Mario Zapata-Herrera, Javier Aizpurua, and Alejandro Martínez

    Physical Review Appllied 18, 044066, 2022.


  8. Injection locking in an optomechanical coherent phonon source

    G. Arregui, M. F. Colombano, J. Maire, A. Pitanti, N. E. Capuj, A. Griol, A. Martínez, C. M. Sotomayor-Torres, D. Navarro-Urrios

    Nanophotonics, Vol. 10, pp. 1319–1327, 2021.


  9. Vertical Engineering for Large Brillouin Gain in Unreleased Silicon-Based Waveguides

    L. Mercadé, A. V. Korovin, Y. Pennec, J. Ahopelto, B. Djafari-Rouhani, A. Martínez

    Physical Review Applied, Vol. 15, 034021, 2021.


  10. Interfering Plasmons in Coupled Nanoresonators to Boost Light Localization and SERS

    A. Xomalis, X. Zheng, A. Demetriadou, A. Martínez, R. Chikkaraddy, J. J. Baumberg

    Nano Letters, Vol.  21, pp. 2512–2518, 2021.


  11. Floquet Phonon Lasing in Multimode Optomechanical Systems

    L. Mercadé, K. Pelka, R. Burgwal, A. Xuereb, A. Martínez, E. Verhagen
    Physical Review Letters, Vol. 127, 073601, 2021.


  12. Radiationless anapole states in on-chip photonics

    E. Díaz-Escobar, T. Bauer , E. Pinilla-Cienfuegos, Á. I. Barreda, A. Griol, L. Kuipers, A. Martínez

    Light: Science & Applications, Vol. 10, 204, 2021.


  13. Photonic Frequency Conversion of OFDM Microwave Signals in a Wavelength-Scale Optomechanical Cavity

    L. Mercadé, M. Morant, A. Griol, R. Llorente, A. Martínez

    Laser and Photonics Reviews, Vol. 15, 2100175, 2021.


  14. Performance improvement of a silicon nitride ring resonator biosensor operated in the TM mode at 1310 nm

    L. Castelló-Pedrero, M. I. Gómez-Gómez, J. García-Rupérez, A. Griol, A. Martínez

    Biomedical Optics Express, Vol. 12, pp. 7244-7260, 2021.


  15. Hybrid photonic-plasmonic cavities based on the nanoparticle-on-a-mirror configuration

    Á. I. Barreda, M. Zapata-Herrera, I. M. Palstra, L. Mercadé, J. Aizpurua, A. Femius Koenderink, A. Martínez

    Photonics Research, Vol. 9, pp. 2398-2419, 2021.


  16. Continuous-Wave Frequency Upconversion with a Molecular Optomechanical Nanocavity

    W. Chen, P. Roelli, H. Hu, S. VerlekarS. P. Amirtharaj, A. I. Barreda, T. J. Kippenberg, M. Kovylina, E. Verhagen, A. Martínez, C. Galland

    Science, vol. 374, pp. 1264-1267, 2021. 


  17. Detecting mid-infrared light by molecular frequency upconversion with dual-wavelength hybrid nanoantennas

    A. XomalisX. Zheng, R. Chikkaraddy, Z. Koczor-Benda, E. Miele, E. Rosta, G. A. E. Vandenbosch, A. Martínez, J. J. Baumberg

    Science, vol. 374, pp. 1268-1271, 2021.


  18. High-Frequency Mechanical Excitation of a Silicon Nanostring with Piezoelectric Aluminum Nitride Layers

    A. Pitanti, T. Makkonen, M. F. Colombano, S. Zanotto, L. Vicarelli, M. Cecchini, A. Griol, D. Navarro-Urrios, C. Sotomayor-Torres, A. Martínez, J. Ahopelto
    Physical Review Applied, Vol. 14, 014054, 2020.


  19. Toward Chiral Sensing and Spectroscopy Enabled by All-Dielectric Integrated Photonic Waveguides

    J. E. Vázquez-Lozano, A. Martínez

    Laser and Photonics Reviews, Vol. 14, 1900422, 2020.



  20. Microwave oscillator and frequency comb in a silicon optomechanical cavity with a full phononic bandgap

    L. Mercadé, L. L. Martín, A. Griol, D. Navarro-Urrios, A. Martínez

    Nanophotonics, Vol. 9, 3535, 2020.



  21. Dispersive optomechanics of supercavity modes in high-index disks

    L. Mercadé, Á. Barreda, A. Martínez

    Optics Letters, Vol. 45, pp. 5238-5241, 2020.



  22. Properties of nanocrystalline silicon probed by optomechanics

    D. Navarro-Urrios, M. F. Colombano, J. Maire, E. Chávez-Ángel, G. Arregui, N. E. Capuj, A. Devos, A. Griol, L. Bellieres, A. Martínez, K. Grigoras, T. Häkkinen, J. Saarilahti, T. Makkonen, C. M. Sotomayor-Torres, J. Ahopelto

    Nanophotonics, Vol. 9, pp. 4819-4829, 2020.


  23. Near-Field Unidirectional Excitation … and Beyond

    J. E. Vázquez-Lozano, A. Martínez,
    Optics and Photonics News, Year in Optics, p. 58, 2019.


  24. Near-Field Directionality Beyond the Dipole Approximation: Electric Quadrupole and Higher-Order Multipole Angular Spectra

    J. E. Vázquez-Lozano, A. Martínez, F. J. Rodríguez-Fortuño
    Physical Review Applied, vol. 12, 024065, 2019.


  25. SERS Detection via Individual Bowtie Nanoantennas Integrated in Si3N4 Waveguides

    J. Losada, A. Raza, S. Clemmen, A. Serrano, A. Griol, R. Baets, A. Martínez
    IEEE Journal of Selected Topics on Quantum Electronics, vol. 25, no. 3, 4600806, 2019.


  26. Synchronization of Optomechanical Nanobeams by Mechanical Interaction

    M. F. Colombano, G. Arregui, N. E. Capuj, A. Pitanti, J. Maire, A. Griol, B. Garrido, A. Martínez, C. M. Sotomayor-Torres, D. Navarro-Urrios
    Physical Review Letters, vol. 123, 017402, 2019.


  27. Generalizing Optical Chirality to an Arbitrary Medium

    J. E. Vázquez-Lozano, A. Martínez,
    Optics and Photonics News, Year in Optics 29, 2018.


  28. Optical modulation of coherent phonon emission in optomechanical cavities

    J. Maire, N. E. Capuj, M. F. Colombano, A. Griol, A. Martinez, C. M. Sotomayor-Torres, D. Navarro-Urrios
    APL Photonics 3, 126102, 2018.


  29. Metamaterial Platforms for Spintronic Modulation of Mid-Infrared Response under Very Weak Magnetic Field

    G. Armelles, L. Bergamini, N. Zabala, F. García, M. L. Dotor, L. Torné, R. Alvaro, A. Griol, A. Martínez, J. Aizpurua, A. Cebollada

    ACS Photonics, Vol. 5, pp. 3956–3961, 2018.


  30. Optical Chirality in Dispersive and Lossy Media

    J. E. Vázquez-Lozano, A. Martínez
    Physical Review Letters, Vol. 121, 043901, 2018.


  31. Coherent Control of a Plasmonic Nanoantenna Integrated on a Silicon Chip

    A. Espinosa-Soria , E. Pinilla-Cienfuegos, F. J. Díaz-Fernández, A. Griol, J. Martí, A. Martínez
    ACS Photonics, Vol. 5, pp. 2712−2717, 2018.


  32. Nanocrystalline silicon optomechanical cavities

    D. Navarro-Urrios, N. E. Capuj, J. Maire, M. Colombano, J. Jaramillo-Fernandez, E. Chavez-Angel, L. L. Martín, L. Mercade, A. Griol, A. Martínez, C. M. Sotomayor-Torres, J. Ahopelto
    Optics Express, Vol. 26, pp. 9829-9839, 2018.


  33. Classical Emergence of Intrinsic Spin-Orbit Interaction of Light at the Nanoscale

    J. E. Vázquez-Lozano, A. Martínez
    Physical Review A, Vol. 97, 033804, 2018.


  34. Polarimetry enabled by nanophotonics

    A. Martínez
    Science, vol. 362, pp. 750-751, 2018


  35. On-chip optimal Stokes nanopolarimetry based on spin-orbit interaction of light

    A. Espinosa-Soria, F. J. Rodríguez-Fortuño, A. Griol, A. Martínez
    Nano Letters, Vol. 17, pp. 3139-3144, 2017.


  36. Nonlinear dynamics and chaos in an optomechanical beam

    D. Navarro-Urrios, N. E. Capuj, M. F. Colombano, P. D. Garcia, M. Sledzinska, F. Alzina, A. Griol, A. Martínez, C. M. Sotomayor-Torres
    Nature Communications, Vol. 8, 14965, 2017.


  37. Fano resonances and electromagnetically induced transparency in silicon waveguides loaded with plasmonic nanoresonators

    R. Ortuño, M. Cortijo, A. Martínez
    Journal of Optics, Vol. 19, 025003, 2017.


  38. Diffusive-light invisibility cloak for transient illumination

    B. Orazbayev, M. Beruete, A. Martínez, C. García-Meca
    Physical Review A, Vol. 94, 063850, 2016.


  39. Exploiting metamaterials, plasmonics and nanoantennas concepts in silicon photonics

    F. J. Rodríguez-Fortuño, A. Espinosa-Soria, A. Martínez
    Topical Review in Journal of Optics, Vol. 18, 123001, 2016.


  40. Experimental measurement of plasmonic nanostructures embedded in silicon waveguide gaps

    A. Espinosa-Soria, A. Griol, A. Martínez
    Optics Express, Vol. 24, pp. 9592-9601, 2016.


  41. Transverse spin and spin-orbit coupling in silicon waveguides

    A. Espinosa-Soria, A. Martínez
    IEEE Photonics Technology Letters, Vol. 28, pp. 1561-1564, 2016.


  42. Lateral forces on circularly polarizable particles near a surface

    F. J. Rodríguez-Fortuño, N. Engheta, A. Martínez, A. V. Zayats
    Nature Communications, Vol. 6, 879, 2015.


Alejandro Martínez - Group leader

Elena Pinilla Cienfuegos - Postdoctoral researcher

Víctor Jesús Gómez Hernández - Postdoctoral researcher

Ana Díaz Rubio - Postdoctoral researcher

Laura Mercadé Morales - Postdoctoral researcher

María Isabel Gómez Gómez - Senior researcher

Miguel Sinusia Lozano - Postdoctoral researcher

Francisco Javier Díaz Fernández - Postdoctoral researcher

Evelyn Díaz Escobar - Predoctoral researcher

Javier Redolat Querol - Predoctoral researcher

Raúl Ortiz Fernández - Predoctoral researcher

Alberto Grau Martínez - Predoctoral researcher

Fernando Martín Romero - Predoctoral researcher

Paula Mouriño Miñambres - Technical staff

Raquel Resta López - Technical staff

Daniel Arenas Ortega - Proyectista


Former members

  • Dr. Francisco José Rodríguez-Fortuño – LinkedIn / Google Scholar


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