1 / 26

Plasmonic Optical Antenna Enhanced Infrared Photodetection

Plasmonic Optical Antenna Enhanced Infrared Photodetection. AFOSR Review 2017. Program director. Dr. Kenneth C. Goretta, AFOSR. Xuejun Lu University of Massachusetts Lowell. 07/13/2017. Outline. Introduction. Objective Approaches. 2. Plasmonic optical antenna enhanced IR detectors.

ygravley
Download Presentation

Plasmonic Optical Antenna Enhanced Infrared Photodetection

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Plasmonic Optical Antenna Enhanced Infrared Photodetection AFOSR Review 2017 Program director Dr. Kenneth C. Goretta, AFOSR Xuejun Lu University of Massachusetts Lowell 07/13/2017

  2. Outline Introduction • Objective • Approaches 2. Plasmonic optical antenna enhanced IR detectors • Far field to near field conversion • Gain, directional patterns, and polarization dependence • Backside configuration • Multispectral coupled rings 3. Conclusion and future work • Antenna cavity and high definition • Nonlinear interaction between plasmonics and low dimensional materials

  3. Introduction Objective: • Investigate antenna theories (e.g. gain, receiving patterns, polarization, etc.) in the optical frequency regimes (10THz - 300THz). • Develop efficient light collection and strong optical confinement in subwavelength region for dynamic polarimetric infrared (IR) imaging. Approaches: • Plasmonic optical antennas (POA) with engineerable polarization and receiving patterns. • Strong SPR surface confinement enhanced photodetection at the subwavelength region. • Plasmonic cavity with perfect absorption.

  4. Introduction RF antennas • Key elements in transmitting and receiving signals in RF microwave spectral regimes. • Engineerable antenna gains and receiving patterns. Optical antennas • Pioneered by Lukas Novotny, etc., extensively researched recently. • Much higher frequency (10THz - 300THz). • Wavelength scaling, m to nm antenna dimensions. Challenges • High frequency (10THz - 300THz), difficult to detect directly. -- Plasmonic induced near fields for enhanced photodetection  POA. -- Plasmonic surface confinement necessitates close integration of POA with the photodetectors.

  5. Introduction Challenges (cont’d) • POA antenna theory compared with RF antenna theory, similarity and difference? Opportunities • Strong plasmonic enhancement, demonstrated 40 times. • Subwavelength focusing well beyond the diffraction limit, 10-20 nm for LWIR (10 m). • Additional design freedom for engineerable antenna gains and receiving patterns.

  6. Pointed dipole POA Resonant condition: • Collect free-space propagation light. • Convert it to surface current in POA. X. Lu, etc. Submitted to IEEE Antenna and Propagation (2017)

  7. Pointed dipole POA Near field profiles Near field current relation: • Surface current generates the near-field. X. Lu, etc. Submitted to IEEE Antenna and Propagation (2017)

  8. Pointed dipole POA Pointed dipole POA enhanced LWIR photodetector • Direct integration on an LWIR photodetector. • Surface confinement induced enhancement. X. Lu, etc. Jphys D (2015)

  9. Pointed dipole POA Angular dependence and receiving patterns X. Lu, etc. Jphys D (2015)

  10. Pointed dipole POA Angular dependence and receiving patterns • Antenna receiving patterns are the same as the full wave dipole antenna. • Verified the POA follows the classical antenna theory in the r.f. frequency regimes. X. Lu, etc. Jphys D (2015)

  11. Pointed dipole POA Polarization dependence X. Lu, etc. Submitted to IEEE Antenna and Propagation (2017)

  12. Pointed dipole POA Polarization dependence • The polarization dependence follows the cos relation defined by the classical antenna theory. X. Lu, etc. Submitted to IEEE Antenna and Propagation (2017)

  13. Reflective POA • The reflective POA shows stronger E-field excitation. • Broadband. X. Lu, etc. Submitted to Semicon. Sci. Tech. (2017)

  14. Reflective POA X. Lu, etc. Submitted to Semicon. Sci. Tech. (2017)

  15. Reflective POA X. Lu, etc. Submitted to Semicon. Sci. Tech. (2017)

  16. Multispectral circular POA • Multispectral enhancement due to the different resonant wavelengths. • Compact and polarization independent device structure for multispectral detectors. • Ideal platform for mutual coupling in POA elements. X. Lu, etc. Submitted to Scientific Report (2017)

  17. Multispectral circular POA • Standing wave in circular ring. • Resonant condition: K’ values are given by F. W. Grover. Etc., Tables for the calculation of the inductance of circular coils of rectangular cross section. d X. Lu, etc. Submitted to Scientific Report (2017)

  18. Multispectral circular POA • Individual rings without coupling. • The RLC model fits in the simulation very well. X. Lu, etc. Submitted to Scientific Report (2017)

  19. Multispectral circular POA • Coupling equations X. Lu, etc. Submitted to Scientific Report (2017)

  20. Multispectral circular POA • Comparison with simulation • Two coupled rings X. Lu, etc. Submitted to Scientific Report (2017)

  21. Multispectral circular POA • Comparison with simulation • Three coupled rings X. Lu, etc. Submitted to Scientific Report (2017)

  22. Perfect absorber photodetector • Meta surface engineering to achieve minimum reflection R()  0. • Transmission T()  0 due to the end surface coating. • R() and T()  0  high energy confinement inside the cavity. N. Liu, etc. Nano Letters, Vol. 10, pp. 2342-2348 (2010)

  23. Perfect absorber photodetector • Embedded LWIR photodetector in the perfect absorber structure. • Low reflection at R() at the plasmonic resonant wavelengths. X. Lu, etc. Jphys D (2016)

  24. Perfect absorber photodetector • Strong E-field confinement inside the perfect absorber cavity at the plasmonic resonant wavelengths. • High photoresponsivity and high QE. X. Lu, etc. Jphys D (2016)

  25. Perfect absorber photodetector X. Lu, etc. Jphys D (2016)

  26. Conclusion and future work • Investigated antennas in the optical spectral regimes and compared with the classical RF antenna theory. The POA optical antennas can still be described using the classical RF antenna theory. • Investigated various POA structures and develop efficient light collection and polarization and receiving pattern control. • Developped optical confinement POAs in subwavelength region for strong plasmonic enhancement and high QE MWIR/LWIR sensing and imaging. • Plan to integrate POA with the perfect absorber cavity for further understanding of plasmonic cavity and material interaction. • Plan to integrate plasmonic enhanced nonlinear EO effect in a strongly confined subwavelength region with low dimensional materials (QD, coupled QW, etc.)

More Related