Engineering Spontaneous Emission in Hybrid Nanoscale Materials for Optoelectronics and Bio-photonics
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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: [email protected] Research Areas. http://www.phys.unt.edu/research/photonic/website/.

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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: [email protected]


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


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


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


Energy Transfer in Quantum Dots entrapped in Hydrogel Microspheres

Arup Neogi, Zhibing Hu

Department of Physics

University of North Texas


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.


Change in scattering properties with particle size

Variation of Particle size with chemistry

Change in scattering properties with turbidity


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


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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