Optimizing light absorption in quantum dot infrared photodetectors by tuning surface confinement of surface plasmonic waves

In this paper, we measured the transmission of the 2DSHA surface plasmonic structures and its variation with the hole diameters a of the 2DSHA structures. The relationship between the transmission and the hole diameters a is found to be different from the prediction of Bethe's diffraction theorem. We also found that the photocurrent of the quantum dot (QD) infrared photodetectors (QDIPs) with different QD active layer thicknesses show different dependence on the hole diameters a of the 2DSHA structures. The photocurrent of the QDIPs with 10 active QD layers (10-QDIPs) saturates and starts to decrease as the hole diameter a is larger than 1.6 µm, whereas that of the QDIPs with 20 active QD layers (20-QDIPs) increases linearly with the hole diameter. The difference in the hole-diameter dependence of the 10-QDIPs and the 20-QDIPs is attributed to the variation of the near-field spreading in the vertical (surface-normal) direction due to the change in the hole diameters. An over 6 time (6×) photocurrent enhancement is obtained by optimizing the hole diameter of the 2DSHA surface plasmonic structure.

[1]  A. Zayats,et al.  Near-field distribution of optical transmission of periodic subwavelength holes in a metal film. , 2001, Physical review letters.

[2]  J. P. Woerdman,et al.  Fano-type interpretation of red shifts and red tails in hole array transmission spectra , 2003, physics/0401054.

[3]  H. Atwater,et al.  Plasmonics for improved photovoltaic devices. , 2010, Nature materials.

[4]  R. H. Ritchie.  Plasma Losses by Fast Electrons in Thin Films , 1957 .

[5]  Puminun Vasinajindakaw,et al.  Surface plasmonic enhanced polarimetric longwave infrared photodetection with band pass spectral filtering , 2012 .

[6]  H. Raether.  Surface Plasmons on Smooth and Rough Surfaces and on Gratings , 1988 .

[7]  Anand Gole,et al.  Surface-enhanced Raman spectroscopy of self-assembled monolayers: sandwich architecture and nanoparticle shape dependence. , 2005, Analytical chemistry.

[8]  M. Futamata.  Surface Plasmon Polariton Enhanced Raman Scattering from Adsorbates on a “Smooth” Metal Surface: The Effect of Thickness and Dielectric Properties of Constituents , 1995 .

[9]  H. Lezec,et al.  Extraordinary optical transmission through sub-wavelength hole arrays , 1998, Nature.

[10]  Sanjay Krishna,et al.  A Surface Plasmon Enhanced Infrared Photodetector Based on Inas Quantum Dots , 2022 .

[11]  H. Bethe.  Theory of Diffraction by Small Holes , 1944 .

[12]  Martin Dressel,et al.  Optical transmission through subwavelength hole arrays in ultrathin metal films , 2011 .

[13]  Yunfeng Ling,et al.  A Fano-type interference enhanced quantum dot infrared photodetector , 2011 .

[14]  S Krishna,et al.  Quantum dot infrared photodetector enhanced by surface plasma wave excitation. , 2009, Optics express.

[15]  Ajay Nahata,et al.  Transmission resonances through aperiodic arrays of subwavelength apertures , 2007, Nature.

[16]  Jarrod Vaillancourt,et al.  Temperature-dependent photoresponsivity and high-temperature (190K) operation of a quantum dot infrared photodetector , 2007 .

[17]  Thomas W. Ebbesen,et al.  Surface plasmons enhance optical transmission through subwavelength holes , 1998 .

[18]  Mark I. Stockman,et al.  Nanoscience: Dark-hot resonances , 2010, Nature.

[19]  Stefan Enoch,et al.  Theory of light transmission through subwavelength periodic hole arrays , 2000 .