- Experimental Condensed Matter Physics
- Optical Metamaterials
- Ultrafast Spectroscopy
Our research primarily focuses on optical and plasmonic properties of nanostructured photonic metamaterials. The inclination toward miniaturization in the emerging generation of nanoscale materials has led to a growing interest in the physics of hybrid nanostructures to understand and exploit interactions arising by confinement, topology and dimensionality. In recent years significant strides have been made in the understanding of phenomena due to the manipulation and organization of atoms and molecules by mimicking processes and strategies adopted by Mother Nature.
My earlier research has mainly involved the experimental study of dynamics, electro-optical properties and lasing in soft matter by means of laser spectroscopies. Random lasing and DFB lasers have been extensively investigated in my group for many years. Another relevant topic we have been interested concerns electro-hydrodynamic instabilities and turbulence in liquid crystals; It has represented an interesting scientific arena to explore the amazing physics behind the chaotic dynamics and random lasing.
More recently, my research interests are focused on the physics of waves and fields in nanostructured plasmonic metamaterials, artificial composite materials whose electromagnetic properties are induced by organizing atoms and molecules at deeply sub-wavelength scales. Nanophotonics is the new branch of physics that is involved to study new effects and phenomena arising from interplay and dynamics between molecules and few tens of atoms thick nanostructures.
Currently, we are exploring several fascinating topics, such as:
- Extreme optics to design biosensing platforms based on hyperbolic metamaterials to detect ultralow molecular weight analytes and biomarkers;
- Indefinite dispersion metamaterials that support virtually infinite photonic density of states (speed-up of QE spontaneous emission; perfect absorption, subwavelength imaging, etc.,)
- Plasmon-exciton interplay and ultrafast dinamics in hybrid nanoassemblies (Purcell effect, Loss mitigation, hot electrons)
- Emission, transport and coherence features in amplifying random laser systems (photon statistics, spatial and temporal coherence, spatial distribution of the emission intensity, confinement geometries);
- Electromagnetic properties of intrinsically active and tunable photonic metamaterials.
These topics allow us to realize a cutting edge research program in the areas of soft-condensed matter, Nanoscience, Biosensing, Spectroscopy, Nonlinear Optics and Nanophotonics.
- K. V. Sreekanth, Y. Alapan, M. ElKabbash, Efe Ilker, M. Hinczewski, U. A. Gurkan, A. De Luca and G. Strangi "Extreme sensitivity biosensing platform based on hyperbolic metamaterials." NATURE MATERIALS 15, 621–627 (2016)
- K. V. Sreekanth, Y. Alapan, M. ElKabbash, Amy M. Wen, Efe Ilker, M. Hinczewski, U. A. Gurkan, Nicole F. Steinmetz and G. Strangi "Enhancing the Angular Sensitivity of Plasmonic Sensors Using Hyperbolic Metamaterials." ADVANCED OPTICAL MATERIALS, 4, 1767–1772 (2016)
- K. V. Sreekanth, K. Hari Krishna, A. De Luca and Giuseppe Strangi "Large Spontaneous Emission Rate Enhancement in Grating Coupled Hyperbolic Metamaterials." Nature – Sci. Rep. 4, 6340 (2014)
- K. V. Sreekanth, A. De Luca, and G. Strangi, "Experimental Demonstration of Surface and Bulk Plasmon Polaritons in Hypergratings." Nature – Sci. Rep. 3, 3291 (2013)
- K. V. Sreekanth, A. De Luca, and G. Strangi "Negative refraction in graphene based metamaterials." Applied Physics Letters 103, 023107 (2013).
- A. De Luca, MP Grzelczak,I. Pastoriza-Santos,L. Liz-Marzan, M. La Deda, M. Striccoli ,and G. Strangi. "Dispersed and Encapsulated Gain Medium in Plasmonic Nanoparticles: a Multipronged Approach to Mitigate Optical Losses." ACS NANO, vol. 5, p. 5823-5829, (2011);
- Carbone F, Sorriso-Valvo L, Versace C, Strangi G, Bartolino R. "Anisotropy of spatiotemporal decorrelation in electrohydrodynamic turbulence." Physical Review Letters vol. 106, 7114 (2011).
- G. Strangi, S. Ferjani, V. Barna, A. De Luca, C. Versace, N. Scaramuzza, and R. Bartolino, "Random Lasing and Weak Localization of Light in Nematic Liquid Crystals" Optics Express 14, 7737 (2006);
- G. Strangi, V. Barna, R. Caputo, A. de Luca, C. Versace, N. Scaramuzza, C. Umeton, R. Bartolino, G. Price: "Color-tunable organic microcavity laser array using distributed feedback.", Phys. Review Letters 94, 063903 (2005). (editorial choice for Vir. Jour. of Nanoscale Science and Technology 11, 8 (2005)