Distinguishable Plasmonic Nanoparticle and Gap Mode Properties in a Silver Nanoparticle on a Gold Film System Using Three-Dimensional FDTD Simulations

Devaraj, Vasanthan; Lee, Jongmin; Oh, Jin Woo

doi:10.3390/nano8080582

Cited by 41 publications

(45 citation statements)

References 51 publications

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“…And most plasmon‐based applications mainly rely on the local field intensity of the metallic nanostructures. From a classical point of view, the local field enhancement factor (EF) in the cavity is obtained from integral volume average of | E / E 0 | 2[ 16,38 ]

E F = \frac{\int true \int \int false| ​ E / E_{0} ​ |^{2} d V}{V}

where E is the local maximum electric field, E 0 is the impinging amplitude of the source electric field, and V is the volume. For the incident amplitude E 0 = 1 V m −1 , the local field intensity of plasmonic nanocavity is often expressed as | E | 2 .…”

Section: Optical Properties Of Plasmonic Nanocavitiesmentioning

confidence: 99%

“…PoM nanocavities, which can support multiple resonances, exhibit deep subdiffraction mode volumes below 10 −7 (λ/ n ) 3 (where λ is the wavelength and n is the refractive index of the cavity). [ 15–19 ] Similarly, dimer nanocavities are realized by bringing two metallic nanostructures into close proximity, resulting in the coupling of their electromagnetic fields which gives rise to an intensely confined hotspots localized inside the gap. [ 20 ] Finally, aperture nanocavities, which can take shapes such as bowtie, rectangular or circular, are formed by engraving nanoholes in thin metallic films.…”

Section: Introductionmentioning

confidence: 99%

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Novel Plasmonic Nanocavities for Optical Trapping‐Assisted Biosensing Applications

Koya

Cunha

Guo

et al. 2020

Advanced Optical Materials

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However, due to the intrinsic low optical response of small objects, there has been a clear trade-off between the size of a material and its response to light. [5] Recently, plasmonic nanostructures have emerged as leading platforms to enhance the weak optical signals of low dimensional materials including quantum dots (QDs), [6] small molecules, [7,8] and 2D monolayers. [9] The plasmonic enhancement of linear and nonlinear optical processes capitalizes on the near-and far-field properties of metallic (e.g., gold and silver) nanostructures. [10] One of the defining features of plasmonic nanostructures is their potential to confine light into deep subwavelength volumes, which has opened a new door to trap and manipulate dielectric, metallic, and biological nano-objects. [11] Moreover, metallic nanostructures are characterized by their capability to amplify the intensity of optical fields by orders of magnitude. The enhancement of local field intensity is attributed to the resonance of plasmon polaritons arising from the coupling of external electromagnetic fields to the collective oscillations of the conduction electrons. [12] A small perturbation (or change in the refractive index) of the near field zone of plasmonic nanostructures leads to significant shift in the plasmon polariton resonance wavelength, which has important implications for surface-enhanced sensing and spectroscopic applications. [13,14] Thus, for the ad-hoc enhancement of optical Plasmonic nanocavities have proved to confine electromagnetic fields into deep subwavelength volumes, implying their potentials for enhanced optical trapping and sensing of nanoparticles. In this review, the fundamentals and performances of various plasmonic nanocavity geometries are explored with specific emphasis on trapping and detection of small molecules and single nanoparticles. These applications capitalize on the local field intensity, which in turn depends on the size of plasmonic nanocavities. Indeed, properly designed structures provide significant local field intensity and deep trapping potential, leading to manipulation of nano-objects with low laser power. The relationship between optical trappinginduced resonance shift and potential energy of plasmonic nanocavity can be analytically expressed in terms of the intercavity field intensity. Within this framework, recent experimental works on trapping and sensing of single nanoparticles and small molecules with plasmonic nanotweezers are discussed. Furthermore, significant consideration is given to conjugation of optical tweezers with Raman spectroscopy, with the aim of developing innovative biosensors. These devices, which take the advantages of plasmonic nanocavities, will be capable of trapping and detecting nanoparticles at the single molecule level.

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E F = \frac{\int true \int \int false| ​ E / E_{0} ​ |^{2} d V}{V}

Section: Optical Properties Of Plasmonic Nanocavitiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Novel Plasmonic Nanocavities for Optical Trapping‐Assisted Biosensing Applications

Koya

Cunha

Guo

et al. 2020

Advanced Optical Materials

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“…To avoid complex quantum effects in NPOM, we started with t Z 2 nm. 45,46 The dielectric layer (refractive index n = 1.5) thickness t was varied from 2 nm to 50 nm. The NP and metallic mirror material properties were assigned to the values for gold.…”

Section: Modelingmentioning

confidence: 99%

“…The refractive index of gold was taken from the Johnson and Christy database and was modeled using Lorentz-Drude dispersion fitting. [44][45][46][47][48] e w ð Þ ¼ 1…”

Section: Modelingmentioning

confidence: 99%

“…These systems display rich plasmonic modes and have a high potential technological utility. 11,16,19,27,35,41,44,45 These NPOM designs mimic theoretical free-space dimer (FSD) designs, in which two metallic nanoparticles (NPs) are separated by a nanogap distance to create a hot spot. 36,44,45 The dielectric layer inserted between the NP and mirror acts as a virtual hot-spot region, in which attractive plasmonic properties can be realized.…”

Section: Introductionmentioning

confidence: 99%

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Defining the plasmonic cavity performance based on mode transitions to realize highly efficient device design

Devaraj

Lee

et al. 2020

Mater. Adv.

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Hybrid Plasmon Mode Enhancing the Lifetime and Forward‐Directional Emission for Solution‐Processed OLEDs

Liang,

Xin,

Yin

et al. 2024

Adv Funct Materials

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Ongoing research is dedicated to tackling the trade‐off between out‐coupling efficiency, transparency, and conductivity for transparent conductive electrodes (TCEs), owing to their continuously increasing application in smartphones/watches, augmented/virtual reality, and naked eye 3D projection. Herein, an aluminum substrate‐mediated hybrid plasmon mode is deliberately embedded in solution‐processed organic light‐emitting diode (SOLED). The created TCE with a 6‐nm‐Al film‐mediated indium tin oxide (ITO) displays an average transmittance of 88.3%, an average ultra‐low haze of 0.2%, and a sheet resistance of 9.5 Ω sq−1, surpassing commercial ITO substrates. By precisely controlling the geometry of this aluminium film/dielectric spacer/silver nanoparticle (Al film‐TAPC‐Ag NP) coupled system, a hybrid dipolar, and quadrupolar mode is required, providing further enhanced scattering strength and plasmon coupling effect in the resultant OLED. These Al film‐TAPC‐Ag NP system mediated SOLEDs display improved decay rate of triplet excitons, elevated electroluminescence out‐coupling efficiency, and suppressed waveguide confinement. Consequently, enhanced stability by 10% after 580 h storage without encapsulation, forward‐directed emission with a ± 70° light‐emitting angle, and a 22% current efficiency enhancement are simultaneously realized, compared with conventional SOLEDs. This work presents new opportunities for LED design and for the implementation of solution‐processed LEDs in large‐area high‐performance displays.

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Distinguishable Plasmonic Nanoparticle and Gap Mode Properties in a Silver Nanoparticle on a Gold Film System Using Three-Dimensional FDTD Simulations

Cited by 41 publications

References 51 publications

Novel Plasmonic Nanocavities for Optical Trapping‐Assisted Biosensing Applications

Novel Plasmonic Nanocavities for Optical Trapping‐Assisted Biosensing Applications

Defining the plasmonic cavity performance based on mode transitions to realize highly efficient device design

Hybrid Plasmon Mode Enhancing the Lifetime and Forward‐Directional Emission for Solution‐Processed OLEDs

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