Abstract

The unprecedented ability of metallic subwavelength structures to confine and concentrate light into subwavelength spaces has led to new physics and exploration of novel devices. In this Letter, we demonstrate a 20 times enhancement of intersubband photoresponse in a InAs quantum dot (QD) system due to evanescently coupled plasmonic field. The resulting enhancement is accompanied by significant narrowing of photoresponse linewidth. The strong enhancement is attributed to efficient coupling of incident field to surface modes and to QDs, the presence of polarization-dependent absorption from QDs, and a fairly strong plasmon–QD interaction.

© 2014 Optical Society of America

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    [CrossRef]
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    [CrossRef]
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    [CrossRef]
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    [CrossRef]
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2013 (1)

2011 (2)

J. Shao, T. E. Vandervelde, A. Barve, W.-Y. Jang, A. Stintz, and S. J. Krishna, J. Vac. Sci. Technol. B 29, 6 (2011).

S. J. Lee, Z. Ku, A. Barve, J. Montoya, W.-Y. Jang, S. R. J. Brueck, M. Sundaram, A. Reisinger, S. Krishna, and S. Noh, Nat. Commun. 2, 286 (2011).
[CrossRef]

2010 (3)

H. A. Atwater and A. Polman, Nat. Mater. 9, 205 (2010).
[CrossRef]

C.-C. Chang, Y. D. Sharma, Y.-S. Kim, J. A. Bur, R. V. Shenoi, S. Krishna, D. Huang, and S.-Y. Lin, Nano Lett. 10, 1704 (2010).
[CrossRef]

W. Wu, A. Bonakdar, and H. Mohseni, Appl. Phys. Lett. 96, 161107 (2010).
[CrossRef]

2009 (3)

J. Rosenberg, R. V. Shenoi, T. E. Vandervelde, S. Krishna, and O. Painter, Appl. Phys. Lett. 95, 161101 (2009).
[CrossRef]

G. Bartal, G. Lerosey, and X. Zhang, Phys. Rev. B 79, 201103 (2009).
[CrossRef]

J. C.-C. Chang, Z.-P. Yang, D. Huang, D. A. Cardimona, and S.-Y. Lin, Opt. Lett. 34, 106 (2009).
[CrossRef]

2005 (1)

S. Krishna, J. Phys. D 38, 2142 (2005).
[CrossRef]

2004 (1)

J. Bellessa, C. Bonnand, J. C. Plenet, and J. Mugnier, Phys. Rev. Lett. 93, 036404 (2004).
[CrossRef]

2003 (2)

D. S. Kim, S. C. Hohng, V. Malyarchuk, Y. C. Yoon, Y. H. Ahn, K. J. Yee, J. W. Park, J. Kim, Q. H. Park, and C. Lienau, Phys. Rev. Lett. 91, 143901 (2003).
[CrossRef]

S. Krishna, S. Raghavan, G. von Wincke, A. Stintz, G. Ariyawansa, S. G. Matsik, and A. G. U. Perera, Appl. Phys. Lett. 83, 2745 (2003).
[CrossRef]

2001 (1)

L. Martin-Moreno, F. J. Garcia-Vidal, H. J. Lezec, K. M. Pellerin, T. Thio, J. B. Pendry, and T. W. Ebbesen, Phys. Rev. Lett. 86, 1114 (2001).
[CrossRef]

1998 (2)

T. W. Ebbesen, H. J. Lezec, H. F. Ghaemi, T. Thio, and P. A. Wolff, Nature 391, 667 (1998).
[CrossRef]

H. C. Liu, M. Buchanan, and Z. R. Wasilewski, Appl. Phys. Lett. 72, 1682 (1998).
[CrossRef]

1992 (1)

A. Kock, E. Gornik, G. Abstreiter, G. Bohm, M. Walther, and G. Weimann, Appl. Phys. Lett. 60, 2011 (1992).
[CrossRef]

Abstreiter, G.

A. Kock, E. Gornik, G. Abstreiter, G. Bohm, M. Walther, and G. Weimann, Appl. Phys. Lett. 60, 2011 (1992).
[CrossRef]

Ahn, Y. H.

D. S. Kim, S. C. Hohng, V. Malyarchuk, Y. C. Yoon, Y. H. Ahn, K. J. Yee, J. W. Park, J. Kim, Q. H. Park, and C. Lienau, Phys. Rev. Lett. 91, 143901 (2003).
[CrossRef]

An, Z.

Ariyawansa, G.

S. Krishna, S. Raghavan, G. von Wincke, A. Stintz, G. Ariyawansa, S. G. Matsik, and A. G. U. Perera, Appl. Phys. Lett. 83, 2745 (2003).
[CrossRef]

Atwater, H. A.

H. A. Atwater and A. Polman, Nat. Mater. 9, 205 (2010).
[CrossRef]

Bartal, G.

G. Bartal, G. Lerosey, and X. Zhang, Phys. Rev. B 79, 201103 (2009).
[CrossRef]

Barve, A.

S. J. Lee, Z. Ku, A. Barve, J. Montoya, W.-Y. Jang, S. R. J. Brueck, M. Sundaram, A. Reisinger, S. Krishna, and S. Noh, Nat. Commun. 2, 286 (2011).
[CrossRef]

J. Shao, T. E. Vandervelde, A. Barve, W.-Y. Jang, A. Stintz, and S. J. Krishna, J. Vac. Sci. Technol. B 29, 6 (2011).

Bellessa, J.

J. Bellessa, C. Bonnand, J. C. Plenet, and J. Mugnier, Phys. Rev. Lett. 93, 036404 (2004).
[CrossRef]

Bohm, G.

A. Kock, E. Gornik, G. Abstreiter, G. Bohm, M. Walther, and G. Weimann, Appl. Phys. Lett. 60, 2011 (1992).
[CrossRef]

Bonakdar, A.

W. Wu, A. Bonakdar, and H. Mohseni, Appl. Phys. Lett. 96, 161107 (2010).
[CrossRef]

Bonnand, C.

J. Bellessa, C. Bonnand, J. C. Plenet, and J. Mugnier, Phys. Rev. Lett. 93, 036404 (2004).
[CrossRef]

Brueck, S. R. J.

S. J. Lee, Z. Ku, A. Barve, J. Montoya, W.-Y. Jang, S. R. J. Brueck, M. Sundaram, A. Reisinger, S. Krishna, and S. Noh, Nat. Commun. 2, 286 (2011).
[CrossRef]

Buchanan, M.

H. C. Liu, M. Buchanan, and Z. R. Wasilewski, Appl. Phys. Lett. 72, 1682 (1998).
[CrossRef]

Bur, J. A.

C.-C. Chang, Y. D. Sharma, Y.-S. Kim, J. A. Bur, R. V. Shenoi, S. Krishna, D. Huang, and S.-Y. Lin, Nano Lett. 10, 1704 (2010).
[CrossRef]

Cardimona, D. A.

Chang, C.-C.

C.-C. Chang, Y. D. Sharma, Y.-S. Kim, J. A. Bur, R. V. Shenoi, S. Krishna, D. Huang, and S.-Y. Lin, Nano Lett. 10, 1704 (2010).
[CrossRef]

Chang, J. C.-C.

Ebbesen, T. W.

L. Martin-Moreno, F. J. Garcia-Vidal, H. J. Lezec, K. M. Pellerin, T. Thio, J. B. Pendry, and T. W. Ebbesen, Phys. Rev. Lett. 86, 1114 (2001).
[CrossRef]

T. W. Ebbesen, H. J. Lezec, H. F. Ghaemi, T. Thio, and P. A. Wolff, Nature 391, 667 (1998).
[CrossRef]

Garcia-Vidal, F. J.

L. Martin-Moreno, F. J. Garcia-Vidal, H. J. Lezec, K. M. Pellerin, T. Thio, J. B. Pendry, and T. W. Ebbesen, Phys. Rev. Lett. 86, 1114 (2001).
[CrossRef]

Ghaemi, H. F.

T. W. Ebbesen, H. J. Lezec, H. F. Ghaemi, T. Thio, and P. A. Wolff, Nature 391, 667 (1998).
[CrossRef]

Gornik, E.

A. Kock, E. Gornik, G. Abstreiter, G. Bohm, M. Walther, and G. Weimann, Appl. Phys. Lett. 60, 2011 (1992).
[CrossRef]

Hohng, S. C.

D. S. Kim, S. C. Hohng, V. Malyarchuk, Y. C. Yoon, Y. H. Ahn, K. J. Yee, J. W. Park, J. Kim, Q. H. Park, and C. Lienau, Phys. Rev. Lett. 91, 143901 (2003).
[CrossRef]

Huang, D.

C.-C. Chang, Y. D. Sharma, Y.-S. Kim, J. A. Bur, R. V. Shenoi, S. Krishna, D. Huang, and S.-Y. Lin, Nano Lett. 10, 1704 (2010).
[CrossRef]

J. C.-C. Chang, Z.-P. Yang, D. Huang, D. A. Cardimona, and S.-Y. Lin, Opt. Lett. 34, 106 (2009).
[CrossRef]

Jang, W.-Y.

S. J. Lee, Z. Ku, A. Barve, J. Montoya, W.-Y. Jang, S. R. J. Brueck, M. Sundaram, A. Reisinger, S. Krishna, and S. Noh, Nat. Commun. 2, 286 (2011).
[CrossRef]

J. Shao, T. E. Vandervelde, A. Barve, W.-Y. Jang, A. Stintz, and S. J. Krishna, J. Vac. Sci. Technol. B 29, 6 (2011).

Kim, D. S.

D. S. Kim, S. C. Hohng, V. Malyarchuk, Y. C. Yoon, Y. H. Ahn, K. J. Yee, J. W. Park, J. Kim, Q. H. Park, and C. Lienau, Phys. Rev. Lett. 91, 143901 (2003).
[CrossRef]

Kim, J.

D. S. Kim, S. C. Hohng, V. Malyarchuk, Y. C. Yoon, Y. H. Ahn, K. J. Yee, J. W. Park, J. Kim, Q. H. Park, and C. Lienau, Phys. Rev. Lett. 91, 143901 (2003).
[CrossRef]

Kim, Y.-S.

C.-C. Chang, Y. D. Sharma, Y.-S. Kim, J. A. Bur, R. V. Shenoi, S. Krishna, D. Huang, and S.-Y. Lin, Nano Lett. 10, 1704 (2010).
[CrossRef]

Kock, A.

A. Kock, E. Gornik, G. Abstreiter, G. Bohm, M. Walther, and G. Weimann, Appl. Phys. Lett. 60, 2011 (1992).
[CrossRef]

Komiyama, S.

Krishna, S.

S. J. Lee, Z. Ku, A. Barve, J. Montoya, W.-Y. Jang, S. R. J. Brueck, M. Sundaram, A. Reisinger, S. Krishna, and S. Noh, Nat. Commun. 2, 286 (2011).
[CrossRef]

C.-C. Chang, Y. D. Sharma, Y.-S. Kim, J. A. Bur, R. V. Shenoi, S. Krishna, D. Huang, and S.-Y. Lin, Nano Lett. 10, 1704 (2010).
[CrossRef]

J. Rosenberg, R. V. Shenoi, T. E. Vandervelde, S. Krishna, and O. Painter, Appl. Phys. Lett. 95, 161101 (2009).
[CrossRef]

S. Krishna, J. Phys. D 38, 2142 (2005).
[CrossRef]

S. Krishna, S. Raghavan, G. von Wincke, A. Stintz, G. Ariyawansa, S. G. Matsik, and A. G. U. Perera, Appl. Phys. Lett. 83, 2745 (2003).
[CrossRef]

Krishna, S. J.

J. Shao, T. E. Vandervelde, A. Barve, W.-Y. Jang, A. Stintz, and S. J. Krishna, J. Vac. Sci. Technol. B 29, 6 (2011).

Ku, Z.

S. J. Lee, Z. Ku, A. Barve, J. Montoya, W.-Y. Jang, S. R. J. Brueck, M. Sundaram, A. Reisinger, S. Krishna, and S. Noh, Nat. Commun. 2, 286 (2011).
[CrossRef]

Lee, S. J.

S. J. Lee, Z. Ku, A. Barve, J. Montoya, W.-Y. Jang, S. R. J. Brueck, M. Sundaram, A. Reisinger, S. Krishna, and S. Noh, Nat. Commun. 2, 286 (2011).
[CrossRef]

Lerosey, G.

G. Bartal, G. Lerosey, and X. Zhang, Phys. Rev. B 79, 201103 (2009).
[CrossRef]

Lezec, H. J.

L. Martin-Moreno, F. J. Garcia-Vidal, H. J. Lezec, K. M. Pellerin, T. Thio, J. B. Pendry, and T. W. Ebbesen, Phys. Rev. Lett. 86, 1114 (2001).
[CrossRef]

T. W. Ebbesen, H. J. Lezec, H. F. Ghaemi, T. Thio, and P. A. Wolff, Nature 391, 667 (1998).
[CrossRef]

Lienau, C.

D. S. Kim, S. C. Hohng, V. Malyarchuk, Y. C. Yoon, Y. H. Ahn, K. J. Yee, J. W. Park, J. Kim, Q. H. Park, and C. Lienau, Phys. Rev. Lett. 91, 143901 (2003).
[CrossRef]

Lin, S.-Y.

C.-C. Chang, Y. D. Sharma, Y.-S. Kim, J. A. Bur, R. V. Shenoi, S. Krishna, D. Huang, and S.-Y. Lin, Nano Lett. 10, 1704 (2010).
[CrossRef]

J. C.-C. Chang, Z.-P. Yang, D. Huang, D. A. Cardimona, and S.-Y. Lin, Opt. Lett. 34, 106 (2009).
[CrossRef]

Liu, H. C.

H. C. Liu, M. Buchanan, and Z. R. Wasilewski, Appl. Phys. Lett. 72, 1682 (1998).
[CrossRef]

Lu, W.

Malyarchuk, V.

D. S. Kim, S. C. Hohng, V. Malyarchuk, Y. C. Yoon, Y. H. Ahn, K. J. Yee, J. W. Park, J. Kim, Q. H. Park, and C. Lienau, Phys. Rev. Lett. 91, 143901 (2003).
[CrossRef]

Mao, F.

Martin-Moreno, L.

L. Martin-Moreno, F. J. Garcia-Vidal, H. J. Lezec, K. M. Pellerin, T. Thio, J. B. Pendry, and T. W. Ebbesen, Phys. Rev. Lett. 86, 1114 (2001).
[CrossRef]

Matsik, S. G.

S. Krishna, S. Raghavan, G. von Wincke, A. Stintz, G. Ariyawansa, S. G. Matsik, and A. G. U. Perera, Appl. Phys. Lett. 83, 2745 (2003).
[CrossRef]

Mohseni, H.

W. Wu, A. Bonakdar, and H. Mohseni, Appl. Phys. Lett. 96, 161107 (2010).
[CrossRef]

Montoya, J.

S. J. Lee, Z. Ku, A. Barve, J. Montoya, W.-Y. Jang, S. R. J. Brueck, M. Sundaram, A. Reisinger, S. Krishna, and S. Noh, Nat. Commun. 2, 286 (2011).
[CrossRef]

Mugnier, J.

J. Bellessa, C. Bonnand, J. C. Plenet, and J. Mugnier, Phys. Rev. Lett. 93, 036404 (2004).
[CrossRef]

Noh, S.

S. J. Lee, Z. Ku, A. Barve, J. Montoya, W.-Y. Jang, S. R. J. Brueck, M. Sundaram, A. Reisinger, S. Krishna, and S. Noh, Nat. Commun. 2, 286 (2011).
[CrossRef]

Painter, O.

J. Rosenberg, R. V. Shenoi, T. E. Vandervelde, S. Krishna, and O. Painter, Appl. Phys. Lett. 95, 161101 (2009).
[CrossRef]

Park, J. W.

D. S. Kim, S. C. Hohng, V. Malyarchuk, Y. C. Yoon, Y. H. Ahn, K. J. Yee, J. W. Park, J. Kim, Q. H. Park, and C. Lienau, Phys. Rev. Lett. 91, 143901 (2003).
[CrossRef]

Park, Q. H.

D. S. Kim, S. C. Hohng, V. Malyarchuk, Y. C. Yoon, Y. H. Ahn, K. J. Yee, J. W. Park, J. Kim, Q. H. Park, and C. Lienau, Phys. Rev. Lett. 91, 143901 (2003).
[CrossRef]

Pellerin, K. M.

L. Martin-Moreno, F. J. Garcia-Vidal, H. J. Lezec, K. M. Pellerin, T. Thio, J. B. Pendry, and T. W. Ebbesen, Phys. Rev. Lett. 86, 1114 (2001).
[CrossRef]

Pendry, J. B.

L. Martin-Moreno, F. J. Garcia-Vidal, H. J. Lezec, K. M. Pellerin, T. Thio, J. B. Pendry, and T. W. Ebbesen, Phys. Rev. Lett. 86, 1114 (2001).
[CrossRef]

Perera, A. G. U.

S. Krishna, S. Raghavan, G. von Wincke, A. Stintz, G. Ariyawansa, S. G. Matsik, and A. G. U. Perera, Appl. Phys. Lett. 83, 2745 (2003).
[CrossRef]

Plenet, J. C.

J. Bellessa, C. Bonnand, J. C. Plenet, and J. Mugnier, Phys. Rev. Lett. 93, 036404 (2004).
[CrossRef]

Polman, A.

H. A. Atwater and A. Polman, Nat. Mater. 9, 205 (2010).
[CrossRef]

Raghavan, S.

S. Krishna, S. Raghavan, G. von Wincke, A. Stintz, G. Ariyawansa, S. G. Matsik, and A. G. U. Perera, Appl. Phys. Lett. 83, 2745 (2003).
[CrossRef]

Reisinger, A.

S. J. Lee, Z. Ku, A. Barve, J. Montoya, W.-Y. Jang, S. R. J. Brueck, M. Sundaram, A. Reisinger, S. Krishna, and S. Noh, Nat. Commun. 2, 286 (2011).
[CrossRef]

Rosenberg, J.

J. Rosenberg, R. V. Shenoi, T. E. Vandervelde, S. Krishna, and O. Painter, Appl. Phys. Lett. 95, 161101 (2009).
[CrossRef]

Shao, J.

J. Shao, T. E. Vandervelde, A. Barve, W.-Y. Jang, A. Stintz, and S. J. Krishna, J. Vac. Sci. Technol. B 29, 6 (2011).

Sharma, Y. D.

C.-C. Chang, Y. D. Sharma, Y.-S. Kim, J. A. Bur, R. V. Shenoi, S. Krishna, D. Huang, and S.-Y. Lin, Nano Lett. 10, 1704 (2010).
[CrossRef]

Shenoi, R. V.

C.-C. Chang, Y. D. Sharma, Y.-S. Kim, J. A. Bur, R. V. Shenoi, S. Krishna, D. Huang, and S.-Y. Lin, Nano Lett. 10, 1704 (2010).
[CrossRef]

J. Rosenberg, R. V. Shenoi, T. E. Vandervelde, S. Krishna, and O. Painter, Appl. Phys. Lett. 95, 161101 (2009).
[CrossRef]

Stintz, A.

J. Shao, T. E. Vandervelde, A. Barve, W.-Y. Jang, A. Stintz, and S. J. Krishna, J. Vac. Sci. Technol. B 29, 6 (2011).

S. Krishna, S. Raghavan, G. von Wincke, A. Stintz, G. Ariyawansa, S. G. Matsik, and A. G. U. Perera, Appl. Phys. Lett. 83, 2745 (2003).
[CrossRef]

Sundaram, M.

S. J. Lee, Z. Ku, A. Barve, J. Montoya, W.-Y. Jang, S. R. J. Brueck, M. Sundaram, A. Reisinger, S. Krishna, and S. Noh, Nat. Commun. 2, 286 (2011).
[CrossRef]

Thio, T.

L. Martin-Moreno, F. J. Garcia-Vidal, H. J. Lezec, K. M. Pellerin, T. Thio, J. B. Pendry, and T. W. Ebbesen, Phys. Rev. Lett. 86, 1114 (2001).
[CrossRef]

T. W. Ebbesen, H. J. Lezec, H. F. Ghaemi, T. Thio, and P. A. Wolff, Nature 391, 667 (1998).
[CrossRef]

Vandervelde, T. E.

J. Shao, T. E. Vandervelde, A. Barve, W.-Y. Jang, A. Stintz, and S. J. Krishna, J. Vac. Sci. Technol. B 29, 6 (2011).

J. Rosenberg, R. V. Shenoi, T. E. Vandervelde, S. Krishna, and O. Painter, Appl. Phys. Lett. 95, 161101 (2009).
[CrossRef]

von Wincke, G.

S. Krishna, S. Raghavan, G. von Wincke, A. Stintz, G. Ariyawansa, S. G. Matsik, and A. G. U. Perera, Appl. Phys. Lett. 83, 2745 (2003).
[CrossRef]

Walther, M.

A. Kock, E. Gornik, G. Abstreiter, G. Bohm, M. Walther, and G. Weimann, Appl. Phys. Lett. 60, 2011 (1992).
[CrossRef]

Wasilewski, Z. R.

H. C. Liu, M. Buchanan, and Z. R. Wasilewski, Appl. Phys. Lett. 72, 1682 (1998).
[CrossRef]

Weimann, G.

A. Kock, E. Gornik, G. Abstreiter, G. Bohm, M. Walther, and G. Weimann, Appl. Phys. Lett. 60, 2011 (1992).
[CrossRef]

Wolff, P. A.

T. W. Ebbesen, H. J. Lezec, H. F. Ghaemi, T. Thio, and P. A. Wolff, Nature 391, 667 (1998).
[CrossRef]

Wu, W.

W. Wu, A. Bonakdar, and H. Mohseni, Appl. Phys. Lett. 96, 161107 (2010).
[CrossRef]

Xiao, S.

Xie, T.

Yang, Z.-P.

Yee, K. J.

D. S. Kim, S. C. Hohng, V. Malyarchuk, Y. C. Yoon, Y. H. Ahn, K. J. Yee, J. W. Park, J. Kim, Q. H. Park, and C. Lienau, Phys. Rev. Lett. 91, 143901 (2003).
[CrossRef]

Yoon, Y. C.

D. S. Kim, S. C. Hohng, V. Malyarchuk, Y. C. Yoon, Y. H. Ahn, K. J. Yee, J. W. Park, J. Kim, Q. H. Park, and C. Lienau, Phys. Rev. Lett. 91, 143901 (2003).
[CrossRef]

Zhang, X.

G. Bartal, G. Lerosey, and X. Zhang, Phys. Rev. B 79, 201103 (2009).
[CrossRef]

Zhou, L.

Appl. Phys. Lett. (5)

A. Kock, E. Gornik, G. Abstreiter, G. Bohm, M. Walther, and G. Weimann, Appl. Phys. Lett. 60, 2011 (1992).
[CrossRef]

J. Rosenberg, R. V. Shenoi, T. E. Vandervelde, S. Krishna, and O. Painter, Appl. Phys. Lett. 95, 161101 (2009).
[CrossRef]

W. Wu, A. Bonakdar, and H. Mohseni, Appl. Phys. Lett. 96, 161107 (2010).
[CrossRef]

S. Krishna, S. Raghavan, G. von Wincke, A. Stintz, G. Ariyawansa, S. G. Matsik, and A. G. U. Perera, Appl. Phys. Lett. 83, 2745 (2003).
[CrossRef]

H. C. Liu, M. Buchanan, and Z. R. Wasilewski, Appl. Phys. Lett. 72, 1682 (1998).
[CrossRef]

J. Phys. D (1)

S. Krishna, J. Phys. D 38, 2142 (2005).
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Figures (5)

Fig. 1.
Fig. 1.

QD-2DHA structure for enhanced QD-plasmon interaction. (a) Schematic of a QD-2DHA device for strong infrared absorption enhancement. The 2DHA is fabricated on top of multiple stacks of QDs. Asymmetric shape of QDs, resulting in polarization dependent absorption, is also indicated. (b) SEM images of fabricated device. Top, bottom contacts and the reflective ground plane (RGP) are shown.

Fig. 2.
Fig. 2.

(a) Spectral response obtained from QD+2DHA detectors of different lattice constants (a=3.2μm, red curve; a=3.1μm, blue curve) and devices with no 2DHA (black curve). The response is measured at 77 K with a bias of 1.5V. (b) The observed response enhancement as a function of the wavelength. A peak enhancement of 21 times is observed at 9 μm. Higher-order resonant peaks with lower enhancements are also observed at λ<5μm.

Fig. 3.
Fig. 3.

Improved device performance: (a) Enhancement in peak responsivity for different operating voltages. A peak responsivity of 1.3A/W is observed. (b) Peak detectivity of 2DHA-QD device as a function of operating voltage. All measurements have been performed at 77 K using f/2 optics.

Fig. 4.
Fig. 4.

FDTD modeling of 2DHA-QD interaction on a structure of pitch a=3.2μm, and d=1.6μm. Computed plots of enhancement with no polarization dependence (black curve), and in the presence of polarized absorption (blue curve). The peak enhancement factor increases from 3 to 7 times as result of polarization dependence.

Fig. 5.
Fig. 5.

Temperature tuning of the QD-plasmon interaction: photoresponse of QD-2DHA device with a=3.2μm measured at (a) 30 K (blue curve), (b) 15 K (red curve). At T<77K, the plots indicate the broadening of response and presence of an additional peak. The Lorentzian fits (in black) for the photoresponse show two peaks separated by an energy ΔE.

Equations (1)

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ζm=σ2DHAJQD2DHA(λ)+σsubJQD(λ)(σ2DHA+σsub)JQD(λ),

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