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Arup Neogi Department of Physics and Materials Engineering University of North Texas

Engineering Spontaneous Emission in Hybrid Nanoscale Materials for Optoelectronics and Bio-photonics. Arup Neogi Department of Physics and Materials Engineering University of North Texas Email: arup@unt.edu. Research Areas. http://www.phys.unt.edu/research/photonic/website/.

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Arup Neogi Department of Physics and Materials Engineering University of North Texas

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  1. Engineering Spontaneous Emission in Hybrid Nanoscale Materials for Optoelectronics and Bio-photonics Arup Neogi Department of Physics and Materials Engineering University of North Texas Email: arup@unt.edu

  2. Research Areas http://www.phys.unt.edu/research/photonic/website/ • Nanoscale Optoelectronic materials for efficient light emission • Biophotonic materials; for hybrid molecular electronics and photonics Ultrafast and Nanoscale Photonics GroupArup Neogi, Department of Physics • Funding: • National Science Foundation • US Department of Energy • Japan Soc. for Promotion of Sciences

  3. Surface plasmons polariton coupling with directional emission • Using subwavelength corrugated surface grating: • Momentum can be transferred to couple the light and plasmon modes • Directional Emission can be improved by using corrugated surfaces

  4. Change in radiative recombination lifetime in Qdots due to resonant exciton-surface plasmon coupling Radiative recombination rate in strained quantum dots emission - observed above the SP emission energy

  5. Energy Transfer in Quantum Dots entrapped in Hydrogel Microspheres Arup Neogi, Zhibing Hu Department of Physics University of North Texas

  6. 1 cm 1 cm 21 oC 35 oC The NIPAM sample in water: Effect of temperature61 Temperature induced changes in hydrogel The phase transition temperature (Tc) of PNIPAM is 34 °C. below Tc, the hydrogel is hydrophilic and swells in water, while above Tc it is hydrophobic and collapses into a small volume.

  7. Change in scattering properties with particle size Variation of Particle size with chemistry Change in scattering properties with turbidity

  8. UV Sunlight The PL image of PNIPAM/CdTe microgel under UV lamp. The image of PNIPAM/CdTe microgel under sunlight Photoluminescence Spectrum of QDs embedded in GEL

  9. Electric Field Induced effects in PNIPA Gels At room temperature No electric field 3.5V/cm electric field *Wu, J. et. al. Phys. Rev. Lett., 90, 48304 (2003) +Hu, Z. et. al. Advan. Mater.13, 1708 (2001)

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