volume | PIER Journals

Abstract

The detailed analysis of localized elongated photonic nanojets generated by a graded-index microellipsoid is reported. Using high resolution finite-difference time-domain simulation, we have studied the distribution of the electric energy density within and in the vicinity outside a dielectric core-shell microellipsoid. Here we consider dielectric composite microellipsoid consisting of a core and several concentric shells having different types of index grading. It becomes possible to elongate the nanojet abnormally. The latitudinal and longitudinal sizes of a nanojet and its peak intensity depending on the optical contrast variation of shells are numerically investigated. The results may provide a new ultra-microscopy technique for optical detection of natural or artificially introduced nanostructures deeply embedded within biological cells.

1. Van de Hulst, H. C., Light Scattering by Small Particles, Dover Publications, New York, 1981.

2. Itagi, A. V. and W. A. Challener, "Optics of photonic nanojets J. Opt. Soc. Am. A,", Vol. 22, 2847-2858, 2005.

3. Li, C., G. W. Kattawar, and P. Zhai, "Electric and magnetic energy density distributions inside and outside dielectric particles illuminated by a plane electromagnetic wave," Opt. Express, Vol. 13, 4554-4559, 2005.
doi:10.1364/OPEX.13.004554

4. Heifetz, A., J. J. Simpson, S. Kong, A. Tflove, V. Backman, and , "Subdiffraction optical resolution of a gold nanosphere located within the nanojet of a Mie-resonant dielectric microsphere," Opt. Express, Vol. 15, 17334-17342, 2007.
doi:10.1364/OE.15.017334

5. Ferrand, P., J. Wenger, A. Devilez, M. Pianta, B. Stout, N. Bonod, E. Popov, and H. Rigneault, "Direct imaging of photonic nanojets," Opt. Express, Vol. 16, 6930-6940, 2008.
doi:10.1364/OE.16.006930

6. Devilez, A., B. Stout, N. Bonod, and E. Popov, "Spectral analysis of three-dimensional photonic jets," Opt. Express, Vol. 16, 14200-14212, 2008.
doi:10.1364/OE.16.014200

7. Holms, K., B. Hourahine, and F. Papoff, "Calculation of internal and scattered fields of axisymmetric nanoparticles at any point in space," J. Opt. A: Pure Appl. Opt., Vol. 11, 054009, 2009.
doi:10.1088/1464-4258/11/5/054009

8. Kim, M., T. Scharf, S. MÄuhlig, C. Rockstuhl, and H. P. Herzig, "Engineering photonic nanojets Opt. Express,", Vol. 19, 10206-10220, 2011.

9. Yang, S., A. Taflove, and V. Backman, "Experimental confirmation at visible light wavelengths of the backscattering enhancement phenomenon of the photonic nanojet," Opt. Express, Vol. 19, 7084-7093, 2011.
doi:10.1364/OE.19.007084

10. Yi, K. J., Y. F. Lu, and Z. Y. Yang, "Enhanced Raman scattering by self-assembled silica spherical microparticles," J. Appl. Phys., Vol. 101, 063528, 2007.
doi:10.1063/1.2450671

11. Lecler, S., S. Haacke, N. Lecong, O. Cregut, J. Rehspringer, and C. Hirlimann, "Photonic jet driven non-linear optics: Example of two-photon °uorescence enhancement by dielectric microspheres," Opt. Express, Vol. 15, 4935-4942, 2007.
doi:10.1364/OE.15.004935

12. Cui, X., D. Erni, and C. Hafner, "Optical forces on metallic nanoparticles induced by a photonic nanojet," Opt. Express, Vol. 16, 13560-13568, 2008.
doi:10.1364/OE.16.013560

13. Wang, Z., W. Guo, L. Li, B. Lukyanchuk, A. Khan, Z. Liu, Z. Chen, and M. Hong, "Optical virtual imaging at 50 nm lateral resolution with a white-light nanoscope," Nat. Commun., Vol. 2, 218, 2011.
doi:10.1038/ncomms1211

14. Kong, S., A. Taflove, and V. Backman, "Quasi one-dimensional light beam generated by a graded-index microsphere," Opt. Express, Vol. 17, 3722-3731, 2009.
doi:10.1364/OE.17.003722

15. Ruiz, C. and J. J. Simpson, "Detection of embedded ultra-subwavelength-thin dielectric features using elongated photonic nanojets," Opt. Express, Vol. 18, 16805-16812, 2010.
doi:10.1364/OE.18.016805

16. Geints, Y., E. K. Panina, and A. A. Zemlyanov, "Control over parameters of photonic nanojets of dielectric microspheres," Opt. Commun., Vol. 283, 4775-4781, 2010.
doi:10.1016/j.optcom.2010.07.007

17. Liu, C.-Y., "Superenhanced photonic nanojet by core-shell microcylinders," Phys. Lett. A, Vol. 376, 1856-1860, 2012.
doi:10.1016/j.physleta.2012.04.035

18. Bohren, C. F. and D. R. Huffman, Absorption and Scattering of Light by Samll Particles, Wiley, New York, 1983.

19. Taflove, A. and S. C. Hagness, "Computational Electrodynamics: The Finite Difference Time Domain Method," Artech House, 1998.

20. Liu, C.-Y., "Electro-optical resonant switching in two-dimensional side-coupled waveguide-cavity photonic crystal systems," Phys. Lett. A, Vol. 375, 3895-3898, 2011.
doi:10.1016/j.physleta.2011.09.024

21. Berenger, J.-P., "A perfectly matched layer for the absorption of electromagnetic waves," J. Comput. Phys., Vol. 114, 185-200, 1994.
doi:10.1006/jcph.1994.1159

22. Li, C., G. W. Kattawar, and P. Yang, "Effects of surface roughness on light scattering by small particles," J. Quant. Spectrosc. Radiat. Transfer, Vol. 89, 123-131, 2004.
doi:10.1016/j.jqsrt.2004.05.016

23. Prodan, E., C. Radloff, N. J. Halas, and P. Nordlander, "A hybridization model for the plasmon response of complex nanostructures," Science, Vol. 302, 419-422, 2003.
doi:10.1126/science.1089171

24. Poco, J. F. and L. W. Hrubesh, "Method of producing optical quality glass having a selected refractive index,", U.S. Patent 6,158,244, 2008.

25. Mazurin, O. V., M. V. Streltsina, and T. P. Shvaiko-Shavaikovskaya, Handbook of Glass Data, Elsevier, Amsterdam, 1993.

Prof. Cheng-Yang Liu