Morphological and SERS Properties of Silver Nanorod Array Films Fabricated by Oblique Thermal Evaporation at Various Substrate Temperatures

Oh, Myoung-Kyu; Shin, Yongseok; Lee, Chang‐Lyoul; De, Ranjit; Kang, Hyon Chol; Yu, Nan; Kim, Bok Hyeon; Kim, Joon Heon; Yang, Jinkyu

doi:10.1515/nano.11671_2015.306

Cited by 4 publications

(5 citation statements)

References 8 publications

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“…(220), (311), and (222) planes, respectively, which correspond to face-centered cubic Ag. The film has a higher intensity of (111) crystal orientation similar to what is reported by Khare et al [12] and Oh et al [13]. Ag films, therefore the reflectance measured on 500 nm Ag film shows the characteristics of Ag and, only reflectance of 500 nm Ag film is shown.…”

Section: Methodssupporting

confidence: 81%

Light-matter interactions in aligned silver nanorod arrays

Uddin

Pasaogullari

2016

Thin Solid Films

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This study presents an experimental evaluation of the light-matter interactions in silver nanorod arrays of various lengths fabricated by electron-beam physical vapor deposition. The reflectance of nanorod arrays is found to decrease with increasing nanorod length, reaches to a minimum and then again increases with increasing length. Since nanorod arrays are subwavelength structures, the decrease in reflectance is primarily due to surface plasmon resonance. At the tip of the nanorods, the light excites the surface plasmons, which propagate along the conductor-dielectric interface. Hence, longer and consequently higher surface area nanorod arrays provide more dielectric-conductor interface for light to couple with the surface plasmons and more surface to scatter resulting in lower reflectance.

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Section: Methodssupporting

confidence: 81%

Light-matter interactions in aligned silver nanorod arrays

Uddin

Pasaogullari

2016

Thin Solid Films

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“…One of the most critical parameters to understand for nanorod arrays is the filling fraction. Small inter-wire spacing often leads to enhanced radiation transport through surface plasmons, which are thought to be the reason for enhanced Raman signals seen by silver nanorods 22 . Figure 4 shows the coupled calculation at the interface between air and Ag NRs with f = 0.1 and 0.3.…”

Section: Resultsmentioning

confidence: 99%

Effective Radiative Properties of Tilted Metallic Nanorod Arrays Considering Polarization Coupling

Lattery

Kim

Choi

et al. 2018

Sci Rep

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With the advent of new nanomanufacturing techniques has come the rise of the field of nanophotonics and an increased need to determine optical properties of novel structures. Commercial software packages are able to estimate the behavior, but require large resources and heavy computational time. By combining coordinate transforms and Effective Medium Theory (EMT), an effective relative permittivity tensor is defined and further exploited to calculate the polarization-coupled Fresnel coefficients through Maxwell’s equations. A uniaxial simplification is made to show the case of tilted nanorod arrays. To demonstrate the flexibility of this system, the interfacial reflectance has been calculated for both s- and p-polarizations as well as the coupled case with the volume filling fractions of f = 0.10 and 0.30 for silver (Ag) and titanium (Ti) nanorods, and a scenario of a Ag nanorod array with polymethyl methacrylate (PMMA) as the surrounding medium. The exact results computed by the finite-difference time-domain method justify the validity of EMT with polarization coupling taken into account. The effects of incidence angle and azimuthal angle on reflectance are also discussed. The relatively simple nature of this approach allows for fast estimations of the optical properties of various nanostructures.

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“…Therefore, taking the wafer and without lithography can simply clamp the mask in thin sheet form along with the wafer or substrate and then go for deposition. Thus, it has the advantage of having nothing to do with a coating of photoresist, exposing using UV light, and then developing the pattern after which we go for thin film deposition before the removal of the resist pattern and getting the desired results 93–97 . However, the major drawback of this method is the quality of the pattern which is generally very poor because, no matter how hard one tries, there are always some gaps left between the mask and the substrate which is ultimately the cause of diffused boundary instead of a sharp one as expected in case of conventional mask‐based process (Figure 7).…”

Section: Methods For Fabrication Of Nanogap Structuresmentioning

confidence: 99%

“…Thus, it has the advantage of having nothing to do with a coating of photoresist, exposing using UV light, and then developing the pattern after which we go for thin film deposition before the removal of the resist pattern and getting the desired results. [93][94][95][96][97] However, the major drawback of this method is the quality of the pattern which is generally very poor because, no matter how hard one tries, there are always some gaps left between the mask and the substrate which is ultimately the cause of diffused boundary instead of a sharp one as expected in case of conventional mask-based process (Figure 7). 98 In the case of normal masking, the definition is only decided by the sharpness of the pattern definition of the masking layer which is far superior and there is no loss in sharpness of the edge pattern due to intimate contact between the masking layer and substrate.…”

Section: Shadow Mask Evaporationmentioning

confidence: 99%

Recent advances in techniques for fabrication and characterization of nanogap biosensors: A review

Adam

Dhahi

Gopinath

et al. 2021

Biotech and App Biochem

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Nanogap biosensors have fascinated researchers due to their excellent electrical properties. Nanogap biosensors comprise three arrays of electrodes that form nanometer-size gaps. The sensing gaps have become the major building blocks of several sensing applications, including bio-and chemosensors. One of the advantages of nanogap biosensors is that they can be fabricated in nanoscale size for various downstream applications. Several studies have been conducted on nanogap biosensors, and nanogap biosensors exhibit potential material properties. The possibilities of combining these unique properties with a nanoscalegapped device and electrical detection systems allow excellent and potential prospects in biomolecular detection. However, their fabrication is challenging as the gap is becoming smaller. It includes high-cost, low-yield, and surface phenomena to move a step closer to the routine fabrications. This review summarizes different feasible techniques in the fabrication of nanogap electrodes, such as preparation by self-assembly with both conventional and nonconventional approaches. This review also presents a comprehensive analysis of the fabrication, potential applications, history, and the current status of nanogap biosensors with a special focus on nanogap-mediated bio-and chemical sonsors.

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Morphological and SERS Properties of Silver Nanorod Array Films Fabricated by Oblique Thermal Evaporation at Various Substrate Temperatures

Cited by 4 publications

References 8 publications

Light-matter interactions in aligned silver nanorod arrays

Light-matter interactions in aligned silver nanorod arrays

Effective Radiative Properties of Tilted Metallic Nanorod Arrays Considering Polarization Coupling

Recent advances in techniques for fabrication and characterization of nanogap biosensors: A review

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