High performing phase-based surface plasmon resonance sensing from metallic nanohole arrays

Cao, Zhaolong; Wong, Shwin-Chung; Wu, Shibin; Ho, H.P.; Ong, H. C.

doi:10.1063/1.4875019

Cited by 25 publications

(14 citation statements)

References 27 publications

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“…Although the redeposition effect is almost inevitable in all ion-involved milling processes, it is still possible to minimize the effect and obtain a smooth surface under optimized conditions. Large area 2D nanorods [77] and nanoholes [78] shown in Figures 2(b) and 2(c) were fabricated by interference lithography. Note that either lift-off or etching is needed to transfer patterns from resists to target materials using interference lithography to define patterns, which is different from direct FIB drilling.…”

Section: Plasmonic Nanostructures For Enhanced Sensing Applicationsmentioning

confidence: 99%

Plasmon‐Enhanced Sensing: Current Status and Prospects

Leong

Jiang

et al. 2015

Journal of Nanomaterials

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By combining different plasmonic nanostructures with conventional sensing configurations, chemical/biosensors with significantly enhanced device performance can be achieved. The fast development of plasmon-assisted devices benefits from the advance of nanofabrication technology. In this review, we first briefly show the experimental configurations for testing plasmon enhanced sensing signals and then summarize the classic nanogeometries which are extensively used in sensing applications. By design, dramatic increment of optical signals can be obtained and further applied to gas, refractive index and liquid sensing.

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Section: Plasmonic Nanostructures For Enhanced Sensing Applicationsmentioning

confidence: 99%

Plasmon‐Enhanced Sensing: Current Status and Prospects

Leong

Jiang

et al. 2015

Journal of Nanomaterials

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“…7-37 Among the above techniques, the SP-based sensors that used metallic structures have attracted enormous attention in recent years because of the obvious advantages for high-density optical integration. [20][21][22][23][24][25][26] Many nanostructures based on LSPR have been proposed to achieve a good sensing performance, such as nanorods, 7,8 nanocubes, 9,10 nanostars, 11,12 nanoantennas, 13,14 double nanopillars, 15 and metamaterials. These attractive properties make the SPs extremely sensitive to the variations of the local refractive index, which is the basis for the localized surface plasmon resonance (LSPR) sensors [7][8][9][10][11][12][13][14][15][16][17][18][19] and surface plasmon resonance (SPR) sensors.…”

Section: Introductionmentioning

confidence: 99%

An ultrahigh-contrast and broadband on-chip refractive index sensor based on a surface-plasmon-polariton interferometer

Wang

Chen

Sun

et al. 2015

Analyst

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Using a double-slit structure fabricated on a gold film or a subwavelength (300 nm) plasmonic waveguide, high-contrast and broadband plasmonic sensors based on the interference of surface plasmon polaritons (SPPs) are experimentally demonstrated on chips. By adjusting the focused spot position of the p-polarized incident light on the double-slit structure to compensate for the propagation loss of the SPPs, the interfering SPPs from the two slits have nearly equal intensities. As a result, nearly completely destructive interference can be experimentally achieved in a broad bandwidth (>200 nm), revealing the robust design and fabrication of the double-slit structure. More importantly, a high sensing figure of merit (FOM*) of >1 × 10(4) RIU(-1) (refractive index unit), which is much greater than the previous experimental results, is obtained at the destructive wavelength because of a high contrast ratio (C = 0.96). The high-contrast and broadband on-chip sensor fabricated on the subwavelength plasmonic waveguide may find important applications in the real-time sensing of particles and molecules.

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“…Therefore, the DTD phenomenon is not limited to a single polarization as reported in previous literature (e.g., refs. ). These abrupt phase changes at 350 nm (Figure e) and 630 nm (Figure f) show the feasibility of achieving two reflectionless points and thus enabling phase sensing under both polarization states on the same chip.…”

mentioning

confidence: 97%

“…Therefore, recently reported topological darkness concept can secure zero reflection by suitably selecting or engineering effective optical constants with mild restrictions to the film quality . According to previous literature, periodic or nonperiodic nanopatterned metal pattern arrays fabricated by top‐down electron‐beam, interference or colloidal lithography, and core–shell Ag/SiO 2 nanoparticle (NP) layers produced by bottom‐up self‐assembly were coated on top of glass or SiO 2 /Si substrates to realize the resonant zero‐reflection condition.…”

mentioning

confidence: 99%

“…However, the reported sensor platform still relies on periodic metal NP arrays fabricated by electron‐beam lithography, which is expensive and difficult to scale over large areas. Also, the intriguing reflectionless point was only observed at a single wavelength under a fixed polarization state . Since the topological effect will release the strict requirement to perfect quality of detailed nanostructures and enable functionality with imperfections, it is of great interest to develop inexpensive approaches to realize the reflectionless condition practically.…”

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confidence: 99%

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Dispersion Topological Darkness at Multiple Wavelengths and Polarization States

Song

Zhang

Duan

et al. 2017

Advanced Optical Materials

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waveguides [5] and slow light systems [6] that are insensitive to imperfections. Therefore, it is generally believed that topological effects promise to result in robust and unique designs and functionalities for future photonic systems. "Topological darkness" is a phenomenon described in the 2D optical-constant space (i.e., refractive index, n, and extinction coefficient, k) using the geometric topological concept. [7,8] To distinguish it from other topological photonic structures designed in wave-vector spaces, [3,4] we will refer to it as dispersion topological darkness (DTD) in this article.Perfect/complete suppression of reflection, as one of the prerequisites to enhance the absorption, was explored extensively using various structures. [9,10] It is in principle achievable in several ideal optical systems under given incident angles, polarization states, and wavelengths [e.g., Brewster angle, [11] prism coupled surface plasmon resonance (SPR) system, [12] coherent absorption system, [13,14] and parity-time metamaterial systems [15,16] , complete suppression of reflection is still challenging due to inhomogeneity, disorder or irregularities of samples, and fabrication errors (e.g., inevitable surface roughness). In particular, if the transmission of a structure is further entirely suppressed, along with the complete suppression of reflection in previously reported DTD phenomena, the perfect/ complete absorption can be guaranteed.According to the Fresnel reflection coefficient for a simple three-layered structure (constructed by a top nanopatterned thin-film with engineerable optical constants, a central lossless spacer layer and a bottom mirror to prevent transmission, see the inset in Figure 1a), a zero reflection line divides the finite optical constant (i.e., n and k) 2D space into two regions (see the solid red curve in Figure 1a). If two endpoints of the dispersion curve for a given top nanopatterned thin film locate in these two regions in this closed finite space (see the blue dotted line in Figure 1a), respectively, Jordan theorem [17] secures at least one intersection point between the zero reflection line and the dispersion curve of the top thin film. Therefore, the condition for zero reflection can always be topologically protected within this closed finite space, which is so called "topological darkness." [7,8] This concept is only related to the effective dispersion Complete suppression of reflection is in principle achievable in ideal optical systems with unique optical features including complete light absorption, abrupt phase change, etc. However, conventional optical systems have an extremely tight tolerance on fabrication errors or inherent roughness of thin films or patterns. Therefore, it is difficult to realize the perfect reflectionless condition in practice. To overcome this challenge, a "topological darkness" concept with mild restrictions to the film quality is proposed using periodic metallic patterns and self-assembled core-shell particles. Due to the topological effect, the robust ...

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High performing phase-based surface plasmon resonance sensing from metallic nanohole arrays

Cited by 25 publications

References 27 publications

Plasmon‐Enhanced Sensing: Current Status and Prospects

Plasmon‐Enhanced Sensing: Current Status and Prospects

An ultrahigh-contrast and broadband on-chip refractive index sensor based on a surface-plasmon-polariton interferometer

Dispersion Topological Darkness at Multiple Wavelengths and Polarization States

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