1Distribution A: Approved for public release; distribution is unlimited
Integrity  Service  Excellence
Adaptive
Multimod...
2Distribution A: Approved for public release; distribution is unlimited
2013 AFOSR SPRING REVIEW
3001B PORTFOLIO OVERVIEW
...
3Distribution A: Approved for public release; distribution is unlimited
Motivation
Shorten time from sense to kill; avoid ...
4Distribution A: Approved for public release; distribution is unlimited
-2 V
S.I. GaAs Substrate
LWIR AlGaAs/GaAs QWIP
NIR...
5Distribution A: Approved for public release; distribution is unlimited
Speed/Sensitivity Trade-Off of IR Detectors
Vladim...
6Distribution A: Approved for public release; distribution is unlimited
Electrically Switchable Plasmonic Polarizers
Xueju...
7Distribution A: Approved for public release; distribution is unlimited
Spectral-Polarization Imaging
Viktor Gruev (Washin...
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9Distribution A: Approved for public release; distribution is unlimited
Crystalline Bismuth Nanowire
Jimmy Xu (Brown)
Bi P...
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InAs/GaSb Type II Superlattices
Sanjay Krishna (N...
11Distribution A: Approved for public release; distribution is unlimited
Single-Crystal Semimetal/Semiconductor Nano-Compo...
12Distribution A: Approved for public release; distribution is unlimited
Funding Trend
I. Adaptive Multimode Sensing – Emp...
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Hwang - Adaptive Multimode Sensing - Spring Review 2013

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Dr. Jim Hwang presents an overview of his program, Adaptive Multimode Sensing, at the AFOSR 2013 Spring Review. At this review, Program Officers from AFOSR Technical Divisions will present briefings that highlight basic research programs beneficial to the Air Force.

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Hwang - Adaptive Multimode Sensing - Spring Review 2013

  1. 1. 1Distribution A: Approved for public release; distribution is unlimited Integrity  Service  Excellence Adaptive Multimode Sensing Date: 07 03 2013 Jim Hwang Program Officer AFOSR/RTD Air Force Research Laboratory
  2. 2. 2Distribution A: Approved for public release; distribution is unlimited 2013 AFOSR SPRING REVIEW 3001B PORTFOLIO OVERVIEW NAME: Jim Hwang BRIEF DESCRIPTION OF PORTFOLIO: Adaptive Multimode Sensing LIST SUB-AREAS IN PORTFOLIO: I. Adaptive Multimode Sensing – Emphasize tunable detectors and different detection modes such as polarization and phase (in addition to intensity and color). Main challenge: phase detection. II. Novel Infrared Sensors – Emphasize novel materials and structures such as quantum dots, nano-wires, type-II superlattices, and 3D integration. Main challenge: dark current. III.Solar Cells, Thermoelectric Coolers & Others – Deemphasize to focus portfolio with reducing budget.
  3. 3. 3Distribution A: Approved for public release; distribution is unlimited Motivation Shorten time from sense to kill; avoid drowning in data
  4. 4. 4Distribution A: Approved for public release; distribution is unlimited -2 V S.I. GaAs Substrate LWIR AlGaAs/GaAs QWIP NIR AlGaAs/GaAs PIN -2 V S.I. GaAs Substrate LWIR AlGaAs/GaAs QWIP NIR AlGaAs/GaAs PIN Near IR LWIR 77 K 3-Color detector demonstrated, too. Optically-Switched 2-Color Infrared Detector Yong-Hang Zhang (Arizona State) & Elizabeth Steenbergen (AFRL/RXAN)
  5. 5. 5Distribution A: Approved for public release; distribution is unlimited Speed/Sensitivity Trade-Off of IR Detectors Vladimir Mitin (Buffalo) & Andrei Sergeev (Buffalo) Potential barriers around charged InAs quantum dots (QDs) in GaAs prevents recombination and prolongs electron lifetime Charged QDs strongly enhance IR response of photo-detectors/solar cells p+ GaAs InAs QDs n+ GaAs InAs QDs n+ GaAs n+ GaAs
  6. 6. 6Distribution A: Approved for public release; distribution is unlimited Electrically Switchable Plasmonic Polarizers Xuejun Lu (Mass-Lowell) Field distribution (resonance wavelength) can be switched by electrically biasing the polarizer RectangularArrayof AuPlasmonicPolarizers
  7. 7. 7Distribution A: Approved for public release; distribution is unlimited Spectral-Polarization Imaging Viktor Gruev (Washington, St. Louis) Color Filters Angle of Polarization Image SEM of Al Nanowires Si Si Cone Polarization Filter
  8. 8. 8Distribution A: Approved for public release; distribution is unlimited 0 100 200 300 400 500 600 700 0.0 0.1 0.2 0.3 0.4 Photocurrent(µA) Time(ns) x0.3 PbS QD 2 nm (111) planes (111) planes 0.004 0.006 0.008 0.010 0.012 0.014 1E-5 1E-4 1E-3 0.01 0.1 250 167 125 100 83 71 1E-1 QDDecayRate(ns-1 ) 1E-2 T (K) 1/T ( K-1) Non-radiative Energy Transfer Si Non-radiative Energy Transfer from Quantum Dots Anupam Madhukar (S. Cal.), M. Mahalingam (RXAN) & G. Brown (RXAN) Controlled energy/charge transfer between colloidal nanostructures and conventional semiconductors Substrate QD 10−1 10−2 10−3 10−4 10−5 PhotoluminescenceDecay(/ns) Si
  9. 9. 9Distribution A: Approved for public release; distribution is unlimited Crystalline Bismuth Nanowire Jimmy Xu (Brown) Bi Pt Bi Pt IR/THz Detector • Bi: only known natural negative index material @ 60um or 5THz • Bi oxides easily • 1st Bi/Pt heterojunction successfully grown
  10. 10. 10Distribution A: Approved for public release; distribution is unlimited InAs/GaSb Type II Superlattices Sanjay Krishna (New Mexico), Vincent Cowan (RVSS), Christian Morath (RVSS) & John Hubbs (RVSS) Collaboration with Raytheon Vision Systems • Type II superlattices with antimonides barriers can compete with HgCdTe for infrared sensing • Strong interests from AFRL (RX, RY, RV), Army NVL, MDA and DARPA • Enhanced multimodal functionality (color, polarization, dynamic range, phase) through integration with metamaterials Mid-IR Response @ 420 K! GaSb InAs EC EV
  11. 11. 11Distribution A: Approved for public release; distribution is unlimited Single-Crystal Semimetal/Semiconductor Nano-Composites Chris Palmstrøm (UCSB) & Kurt Eyink (AFRL/RXAN) IncreasingErSbcomposition[001] ρ ˔ ρ// {110} GaSb ErSb GaSb ErSb GaSb(ErSb)x(GaSb)1-x (Semimetal) (Semiconductor) •ErSb/GaSb nano- composites grown by molecular beam epitaxy •Buried conductive layers for multicolor infrared detectors •THz polarizers embedded in III-V heterostructures
  12. 12. 12Distribution A: Approved for public release; distribution is unlimited Funding Trend I. Adaptive Multimode Sensing – Emphasize tunable detectors and different detection modes such as polarization and phase (in addition to intensity and color). Main challenge: phase detection. II. Novel Infrared Sensors – Emphasize novel materials and structures such as quantum dots, nano- wires, type-II superlattices, and 3D integration. Main challenge: dark current. III.Solar Cells, Thermoelectric Coolers & Others – Deemphasize to focus portfolio with reducing budget.

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