[1] F. López-Tejeira, S. G. Rodrigo, L. Martín-Moreno, F. J. García-Vidal, E. Devaux, T. W. Ebbesen, J. R. Krenn, I. P. Radko, S. I. Bozhevolnyi, M. U. González, J. C. Weeber, A. Dereux. Efficient unidirectional nanoslit couplers for surface plasmons. Nat. Phys., 3, 324-328(2007).

[2] Y. Jiao, L. H. Liu, P.-F. Hsu. Widening absorption band of grating structure with complex dual-groove grating. J. Heat Transfer, 135, 032701(2013).

[3] J. Feng, T. Okamoto, S. Kawata. Enhancement of electroluminescence through a two-dimensional corrugated metal film by grating-induced surface-plasmon cross coupling. Opt. Lett., 30, 2302-2304(2005).

[4] J. M. Steele, Z. Liu, Y. Wang, X. Zhang. Resonant and non-resonant generation and focusing of surface plasmons with circular gratings. Opt. Express, 14, 5664-5670(2006).

[5] Z. Liu, J. M. Steele, W. Srituravanich, Y. Pikus, C. Sun, X. Zhang. Focusing surface plasmons with a plasmonic lens. Nano Lett., 5, 1726-1729(2005).

[6] Z. Sun, Y. S. Jung, H. K. Kim. Role of surface plasmons in the optical interaction in metallic gratings with narrow slits. Appl. Phys. Lett., 83, 3021-3023(2003).

[7] A. Kubo, Y. S. Jung, H. K. Kim, H. Petek. Femtosecond microscopy of localized and propagating surface plasmons in silver gratings. J. Phys. B, 40, S259-S272(2007).

[8] K. M. Byun, S. J. Kim, D. Kim. Grating-coupled transmission-type surface plasmon resonance sensors based on dielectric and metallic gratings. Appl. Opt., 46, 5703-5708(2007).

[9] J. Lu, C. Petre, E. Yablonovitch, J. Conway. Numerical optimization of a grating coupler for the efficient excitation of surface plasmons at an Ag-SiO_2 interface. J. Opt. Soc. Am. B, 24, 2268-2272(2007).

[10] J. Guo, Y. Tu, L. Yang, L. Wang, B. Wang. Design of a double grating-coupled surface plasmon color filter. Proc. SPIE, 9744, 97440C(2016).

[11] C. L. Tan, V. V. Lysak, K. Alameh, Y. T. Lee. Absorption enhancement of 980  nm MSM photodetector with a plasmonic grating structure. Opt. Commun., 283, 1763-1767(2010).

[12] J. T. Choy, I. Bulu, B. J. M. Hausmann, E. Janitz, I.-C. Huang, M. Lončar. Spontaneous emission and collection efficiency enhancement of single emitters in diamond via plasmonic cavities and gratings. Appl. Phys. Lett., 103, 161101(2013).

[13] A. Sobhani, M. W. Knight, Y. Wang, B. Zheng, N. S. King, L. V. Brown, Z. Fang, P. Nordlander, N. J. Halas. Narrowband photodetection in the near-infrared with a plasmon-induced hot electron device. Nat. Commun., 4, 1643(2013).

[14] Y. Mishima, H. Habara, K. A. Tanaka. Two plasmonic mode excitation using a double-step rectangle grating. J. Opt. Soc. Am. B, 32, 1804-1808(2015).

[15] R. Alaee, D. Lehr, R. Filter, F. Lederer, E.-B. Kley, C. Rockstuhl, A. Tünnermann. Scattering dark states in multiresonant concentric plasmonic nanorings. ACS Photon., 2, 1085-1090(2015).

[16] N. Rahbany, W. Geng, S. Blaize, R. Salas-Montiel, R. Bachelot, C. Couteau. Integrated plasmonic double bowtie/ring grating structure for enhanced electric field confinement. Nanospectroscopy, 1, 61-66(2015).

[17] N. Rahbany, W. Geng, R. Salas-Montiel, S. de la Cruz, E. R. Méndez, S. Blaize, R. Bachelot, C. Couteau. A concentric plasmonic platform for the efficient excitation of surface plasmon polaritons. Plasmonics, 11, 175-182(2015).

[18] C. Min, J. Li, G. Veronis, J.-Y. Lee, S. Fan, P. Peumans. Enhancement of optical absorption in thin-film organic solar cells through the excitation of plasmonic modes in metallic gratings. Appl. Phys. Lett., 96, 133302(2010).

[19] J. N. Munday, H. A. Atwater. Large integrated absorption enhancement in plasmonic solar cells by combining metallic gratings and antireflection coatings. Nano Lett., 11, 2195-2201(2011).

[20] J. You, X. Li, F. Xie, W. E. I. Sha, J. H. W. Kwong, G. Li, W. C. H. Choy, Y. Yang. Surface plasmon and scattering-enhanced low-bandgap polymer solar cell by a metal grating back electrode. Adv. Energy Mater., 2, 1203-1207(2012).

[21] R. A. Pala, J. S. Q. Liu, E. S. Barnard, D. Askarov, E. C. Garnett, S. Fan, M. L. Brongersma. Optimization of non-periodic plasmonic light-trapping layers for thin-film solar cells. Nat. Commun., 4, 2095(2013).

[22] N.-F. Chiu, C.-D. Yang, Y.-L. Kao, C.-J. Cheng. Design of plasmonic circular grating with broadband absorption enhancements. Proc. SPIE, 9502, 950213(2015).

[23] A. W. Wark, H. J. Lee, A. J. Qavi, R. M. Corn. Nanoparticle-enhanced diffraction gratings for ultrasensitive surface plasmon biosensing. Anal. Chem., 79, 6697-6701(2007).

[24] K. M. Byun, S. J. Yoon, D. Kim, S. J. Kim. Experimental study of sensitivity enhancement in surface plasmon resonance biosensors by use of periodic metallic nanowires. Opt. Lett., 32, 1902-1904(2007).

[25] J. Dostálek, J. Homola. Surface plasmon resonance sensor based on an array of diffraction gratings for highly parallelized observation of biomolecular interactions. Sens. Actuators B, 129, 303-310(2008).

[26] H. J. Lee, A. W. Wark, R. M. Corn. Enhanced bioaffinity sensing using surface plasmons, surface enzyme reactions, nanoparticles and diffraction gratings. Analyst, 133, 596-601(2008).

[27] H. N. Daghestani, B. W. Day. Theory and applications of surface plasmon resonance, resonant mirror, resonant waveguide grating, and dual polarization interferometry biosensors. Sensors, 10, 9630-9646(2010).

[28] K. Tawa, H. Hori, K. Kintaka, K. Kiyosue, Y. Tatsu, J. Nishii. Optical microscopic observation of fluorescence enhanced by grating-coupled surface plasmon resonance. Opt. Express, 16, 9781-9790(2008).

[29] H. Hori, K. Tawa, K. Kintaka, J. Nishii, Y. Tatsu. Influence of groove depth and surface profile on fluorescence enhancement by grating-coupled surface plasmon resonance. Opt. Rev., 16, 216-221(2010).

[30] X. Cui, K. Tawa, K. Kintaka, J. Nishii. Enhanced fluorescence microscopic imaging by plasmonic nanostructures: from a 1D grating to a 2D nanohole array. Adv. Funct. Mater., 20, 945-950(2010).

[31] Y. Jiang, H.-Y. Wang, H. Wang, B.-R. Gao, Y. Hao, Y. Jin, Q.-D. Chen, H.-B. Sun. Surface plasmon enhanced fluorescence of dye molecules on metal grating films. J. Phys. Chem. C, 115, 12636-12642(2011).

[32] P. B. Catrysse, G. Veronis, H. Shin, J.-T. Shen, S. Fan. Guided modes supported by plasmonic films with a periodic arrangement of subwavelength slits. Appl. Phys. Lett., 88, 031101(2006).

[33] T. Xu, Y. Zhao, D. Gan, C. Wang, C. Du, X. Luo. Directional excitation of surface plasmons with subwavelength slits. Appl. Phys. Lett., 92, 101501(2008).

[34] D. Arbel, M. Orenstein. Plasmonic modes in W-shaped metal-coated silicon grooves. Opt. Express, 16, 3114-3119(2008).

[35] A. Dhawan, M. Canva, T. Vo-Dinh. Narrow groove plasmonic nano-gratings for surface plasmon resonance sensing. Opt. Express, 19, 787-813(2011).

[36] T. Søndergaard, S. M. Novikov, T. Holmgaard, R. L. Eriksen, J. Beermann, Z. Han, K. Pedersen, S. I. Bozhevolnyi. Plasmonic black gold by adiabatic nanofocusing and absorption of light in ultra-sharp convex grooves. Nat Commun., 3, 969(2012).

[37] W. Zhu, M. G. Banaee, D. Wang, Y. Chu, K. B. Crozier. Lithographically fabricated optical antennas with gaps well below 10  nm. Small, 7, 1761-1766(2011).

[38] X. Chen, H.-R. Park, M. Pelton, X. Piao, N. C. Lindquist, H. Im, Y. J. Kim, J. S. Ahn, K. J. Ahn, N. Park, D.-S. Kim, S.-H. Oh. Atomic layer lithography of wafer-scale nanogap arrays for extreme confinement of electromagnetic waves. Nat Commun., 4, 2361(2013).

[39] X. Chen, C. Ciracì, D. R. Smith, S.-H. Oh. Nanogap-enhanced infrared spectroscopy with template-stripped wafer-scale arrays of buried plasmonic cavities. Nano Lett., 15, 107-113(2015).

[40] C. Lumdee, B. Yun, P. G. Kik. Gap-plasmon enhanced gold nanoparticle photoluminescence. ACS Photon., 1, 1224-1230(2014).

[41] D. R. Ward, N. K. Grady, C. S. Levin, N. J. Halas, Y. Wu, P. Nordlander, D. Natelson. Electromigrated nanoscale gaps for surface-enhanced Raman spectroscopy. Nano Lett., 7, 1396-1400(2007).

[42] D. R. Ward, F. Hüser, F. Pauly, J. C. Cuevas, D. Natelson. Optical rectification and field enhancement in a plasmonic nanogap. Nat. Nanotechnol., 5, 732-736(2010).

[43] H. Im, K. C. Bantz, N. C. Lindquist, C. L. Haynes, S.-H. Oh. Vertically oriented sub-10-nm plasmonic nanogap arrays. Nano Lett., 10, 2231-2236(2010).

[44] J. Chen, G. Qin, J. Wang, J. Yu, B. Shen, S. Li, Y. Ren, L. Zuo, W. Shen, B. Das. One-step fabrication of sub-10-nm plasmonic nanogaps for reliable SERS sensing of microorganisms. Biosens. Bioelectron., 44, 191-197(2013).

[45] A. García-Martín, D. R. Ward, D. Natelson, J. C. Cuevas. Field enhancement in subnanometer metallic gaps. Phys. Rev. B, 83, 193404(2011).

[46] D. Natelson, Y. Li, J. B. Herzog. Nanogap structures: combining enhanced Raman spectroscopy and electronic transport. Phys. Chem. Chem. Phys., 15, 5262-5275(2013).

[47] T. Kawawaki, Y. Takahashi, T. Tatsuma. Enhancement of dye-sensitized photocurrents by gold nanoparticles: effects of plasmon coupling. J. Phys. Chem. C, 117, 5901-5907(2013).

[48] T. Chen, M. Pourmand, A. Feizpour, B. Cushman, B. M. Reinhard. Tailoring plasmon coupling in self-assembled one-dimensional Au nanoparticle chains through simultaneous control of size and gap separation. J. Phys. Chem. Lett., 4, 2147-2152(2013).

[49] S. J. Bauman, D. T. Debu, A. M. Hill, E. C. Novak, D. Natelson, J. B. Herzog. Optical nanogap matrices for plasmonic enhancement applications. Proc. SPIE, 9163, 91631A(2014).

[50] T. K. Manna, S. M. Mahajan. Nanotechnology in the development of photovoltaic cells. International Conference on Clean Electrical Power (ICCEP), 379-386(2007).

[51] E. T. Yu, D. Derkacs, P. Matheu, D. M. Schaadt. Plasmonic nanoparticle scattering for enhanced performance of photovoltaic and photodetector devices. Proc. SPIE, 7033, 70331V(2008).

[52] K. Nakayama, K. Tanabe, H. A. Atwater. Plasmonic nanoparticle enhanced light absorption in GaAs solar cells. Appl. Phys. Lett., 93, 121904(2008).

[53] V. E. Ferry, L. A. Sweatlock, D. Pacifici, H. A. Atwater. Plasmonic nanostructure design for efficient light coupling into solar cells. Nano Lett., 8, 4391-4397(2008).

[54] N. N. Lal, B. F. Soares, J. K. Sinha, F. Huang, S. Mahajan, P. N. Bartlett, N. C. Greenham, J. J. Baumberg. Enhancing solar cells with localized plasmons in nanovoids. Opt. Express, 19, 11256-11263(2011).

[55] R. Yu, Q. Lin, S.-F. Leung, Z. Fan. Nanomaterials and nanostructures for efficient light absorption and photovoltaics. Nano Energy, 1, 57-72(2012).

[56] I. Massiot, N. Vandamme, N. Bardou, C. Dupuis, A. Lemaître, J.-F. Guillemoles, S. Collin. Metal nanogrid for broadband multiresonant light-harvesting in ultrathin GaAs layers. ACS Photon., 1, 878-884(2014).

[57] A. G. Brolo, E. Arctander, R. Gordon, B. Leathem, K. L. Kavanagh. Nanohole-enhanced Raman scattering. Nano Lett., 4, 2015-2018(2004).

[58] J. M. Baik, S. J. Lee, M. Moskovits. Polarized surface-enhanced raman spectroscopy from molecules adsorbed in nano-gaps produced by electromigration in silver nanowires. Nano Lett., 9, 672-676(2009).

[59] A. W. Clark, J. M. Cooper. Nanogap ring antennae as plasmonically coupled SERRS substrates. Small, 7, 119-125(2011).

[60] W. Yue, Z. Wang, Y. Yang, L. Chen, A. Syed, K. Wong, X. Wang. Electron-beam lithography of gold nanostructures for surface-enhanced Raman scattering. J. Micromech. Microeng., 22, 125007(2012).

[61] M. Abb, Y. Wang, N. Papasimakis, C. H. de Groot, O. L. Muskens. Surface-enhanced infrared spectroscopy using metal oxide plasmonic antenna arrays. Nano Lett., 14, 346-352(2014).

[62] Y. Zhang, Y.-R. Zhen, O. Neumann, J. K. Day, P. Nordlander, N. J. Halas. Coherent anti-Stokes Raman scattering with single-molecule sensitivity using a plasmonic Fano resonance. Nat. Commun., 5, 1-7(2014).

[63] M. D. Sonntag, J. M. Klingsporn, A. B. Zrimsek, B. Sharma, L. K. Ruvuna, R. P. Van Duyne. Molecular plasmonics for nanoscale spectroscopy. Chem. Soc. Rev., 43, 1230-1247(2014).

[64] R. Gordon, D. Sinton, A. G. Brolo, K. L. Kavanagh. Plasmonic sensors based on nano-holes: technology and integration. Proc. SPIE, 6959, 695913(2008).

[65] J. B. Herzog, M. W. Knight, Y. Li, K. M. Evans, N. J. Halas, D. Natelson. Dark plasmons in hot spot generation and polarization in interelectrode nanoscale junctions. Nano Lett., 13, 1359-1364(2013).

[66] J. Homola. Present and future of surface plasmon resonance biosensors. Anal. Bioanal. Chem., 377, 528-539(2003).

[67] J. N. Anker, W. P. Hall, O. Lyandres, N. C. Shah, J. Zhao, R. P. Van Duyne. Biosensing with plasmonic nanosensors. Nat. Mater., 7, 442-453(2008).

[68] I. Abdulhalim, M. Zourob, A. Lakhtakia. Surface plasmon resonance for biosensing: a mini-review. Electromagnetics, 28, 214-242(2008).

[69] T. Vo-Dinh, H.-N. Wang, J. Scaffidi. Plasmonic nanoprobes for SERS biosensing and bioimaging. J. Biophoton., 3, 89-102(2010).

[70] K. C. Bantz, A. F. Meyer, N. J. Wittenberg, H. Im, Ö. Kurtuluş, S. H. Lee, N. C. Lindquist, S.-H. Oh, C. L. Haynes. Recent progress in SERS biosensing. Phys. Chem. Chem. Phys., 13, 11551-11567(2011).

[71] A. G. Brolo. Plasmonics for future biosensors. Nat. Photonics, 6, 709-713(2012).

[72] A. Sivanesan, E. L. Izake, R. Agoston, G. A. Ayoko, M. Sillence. Reproducible and label-free biosensor for the selective extraction and rapid detection of proteins in biological fluids. J. Nanobiotechnol., 13, 43(2015).

[73] S. J. Bauman, E. C. Novak, D. T. Debu, D. Natelson, J. B. Herzog. Fabrication of sub-lithography-limited structures via nanomasking technique for plasmonic enhancement applications. IEEE Trans. Nanotechnol., 14, 790-793(2015).

[74] S. J. Bauman. Fabrication of sub-10  nm metallic structures via nanomasking technique for plasmonic enhancement applications(2015).

[75] P. B. Johnson, R. W. Christy. Optical constants of the noble metals. Phys. Rev. B, 6, 4370-4379(1972).

[76] T. C. Choy. Effective Medium Theory: Principles and Applications(2015).

[77] J. B. Herzog, M. W. Knight, D. Natelson. Thermoplasmonics: quantifying plasmonic heating in single nanowires. Nano Lett., 14, 499-503(2014).

[78] C. Saylor, E. Novak, D. Debu, J. B. Herzog. Investigation of maximum optical enhancement in single gold nanowires and triple nanowire arrays. J. Nanophoton., 9, 093053(2015).

[79] A. S. Hall, M. Faryad, G. D. Barber, A. Lakhtakia, T. E. Mallouk. Effect of grating period on the excitation of multiple surface-plasmon-polariton waves guided by the interface of a metal grating and a photonic crystal. Proc. SPIE, 8620, 862003(2013).

[80] C.-H. Lin, C. Hsieh, C.-G. Tu, Y. Kuo, H.-S. Chen, P.-Y. Shih, C.-H. Liao, Y.-W. Kiang, C. C. Yang, C.-H. Lai, G.-R. He, J.-H. Yeh, T.-C. Hsu. Efficiency improvement of a vertical light-emitting diode through surface plasmon coupling and grating scattering. Opt. Express, 22, A842-A856(2014).

[81] X. H. Xiong, L. M. Zhan, X. Ke. Effects of grating slant angle on surface plasmon resonance and its applications for sensors. Appl. Mech. Mater., 536–537, 342-345(2014).

[82] F. Liu, X. Zhang. Fano coupling between Rayleigh anomaly and localized surface plasmon resonance for sensor applications. Biosens. Bioelectron., 68, 719-725(2015).

[83] E. Prodan, C. Radloff, N. J. Halas, P. Nordlander. A hybridization model for the plasmon response of complex nanostructures. Science, 302, 419-422(2003).

[84] P. Nordlander, C. Oubre, E. Prodan, K. Li, M. I. Stockman. Plasmon hybridization in nanoparticle dimers. Nano Lett., 4, 899-903(2004).

[85] D. W. Brandl, C. Oubre, P. Nordlander. Plasmon hybridization in nanoshell dimers. J. Chem. Phys., 123, 024701(2005).

[86] M. Sukharev, A. Nitzan. Plasmon transmission through excitonic subwavelength gaps(2016).

[87] K. Li, K. Jiang, L. Zhang, Y. Wang, L. Mao, J. Zeng, Y. Lu, P. Wang. Raman scattering enhanced within the plasmonic gap between an isolated Ag triangular nanoplate and Ag film. Nanotechnology, 27, 165401(2016).