Optical nanospectroscopy study of ion-implanted silicon and biological growth medium

Cricenti, A.; Marocchi, V.; Generosi, R.; Luce, M.; Perfetti, P.; Vobornik, Dušan; Margaritondo, G.; Talley, David B.; Thielen, Peter A.; Sanghera, J.S.; Aggarwal, Ishwar D.; Miller, J. Keith; Tolk, N. H.; Piston, David W.

doi:10.1016/s0925-8388(03)00557-7

Cited by 9 publications

(10 citation statements)

References 9 publications

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“…We will present in this article images with resolutions of the order of λ/60 with SNOM working with infrared light. With our SNOM setup, we routinely get optical resolutions between 50 and 150 nm, regardless of the wavelength of the light used to illuminate the sample [4,[10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Spectroscopic infrared scanning near-field optical microscopy (IR-SNOM)

Vobornik

Margaritondo

Sanghera

et al. 2005

Journal of Alloys and Compounds

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Scanning near-field optical microscopy (SNOM or NSOM) is the technique with the highest lateral optical resolution available today, while infrared (IR) spectroscopy has a high chemical specificity. Combining SNOM with a tunable IR source produces a unique tool, IR-SNOM, capable of imaging distributions of chemical species with a 100 nm spatial resolution. We present in this paper boron nitride (BN) thin film images, where IR-SNOM shows the distribution of hexagonal and cubic phases within the sample. Exciting potential applications in biophysics and medical sciences are illustrated with SNOM images of the distribution of different chemical species within cells. We present in this article images with resolutions of the order of λ/60 with SNOM working with infrared light. With our SNOM setup, we routinely get optical resolutions between 50 and 150 nm, regardless of the wavelength of the light used to illuminate the sample.

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Section: Introductionmentioning

confidence: 99%

Spectroscopic infrared scanning near-field optical microscopy (IR-SNOM)

Vobornik

Margaritondo

Sanghera

et al. 2005

Journal of Alloys and Compounds

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“…The extinction signal of the samples has been detected in a reflection acquisition mode: the sample can be illuminated on top by an external source, laser, with different wavelengths l, (l = 488 nm, 632 nm, 780 nm were used), in turn, an optical fibre was used for the detection of the reflected signals. The results obtained using the SNOM in collection mode with a 780 nm wavelength laser light have been already described elsewhere [20]. The absorption sour− ces were meanly of two types, point−like and enlarged.…”

Section: Resultsmentioning

confidence: 95%

“…In addition, if we consider a near field solution of elec− tric and magnetic fields and the field enhancement in z−direction in proximity of the SNOM probe tip, under some specific conditions we can observe intense enhanced absor− ption being meanly the E z components under theSNOM tip about 10 times larger compared to the in−plane components, it is reasonable to suppose that when the probe signal dis− plays a point−like absorption peaks, this can be identified with a nanoshell [20]. This is because the field enhancement caused by the local surface plasmon resonance mainly focu− ses on the metal−dielectric interface (and decays exponen− tially); in addition it is not absorbed by the biological tissue due to the transparency window.…”

Section: Optical Response From Single To Randomly Distributed Clustermentioning

confidence: 95%

Ultra small clusters of gold nanoshells detected by SNOM

Cricenti

Luce

Moroni

et al. 2015

Opto-Electronics Review

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Metal nanoshells are a type of nanoparticle composed by a dielectric core and a metallic coating. These nanoparticles have stimulated interest due to their remarkable optical properties. In common with metal colloids, they show distinctive absorption peaks at specific wavelengths due to surface plasmon resonance. However, unlike bare metal colloids, the wavelengths at which resonance occurs can be tuned by changing the core radius and coating thickness. One basic application of such property is in medicine, where it is hoped that nanoshells with absorption peaks in the near−infrared can be attached to cancerous cells. In this paper, we study the changes of optical response in visible and near infrared wavelengths from single to randomly distributed clusters of nanoshells. The results were obtained using a novel formulation of Mie theory in evanescent wave conditions, with a finite−difference time−domain (FDTD) simulation and experimentally on BaTiO

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“…2 Experimental setup and sample preparation Figure 1 shows the setup, built around Olympus IX71 inverted microscope, homemade SNOM scanner system [9], and commercial research-grade spectrometer from Princeton Instruments / Acton Research. High quality of SNOM scanner with metal-coated fiber tips, superior frame stability and vibration-free operation of the Olympus IX71 make the setup well suited for stable observations.…”

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confidence: 99%

“…Typical tips have a taper length of 200-500 µm and end 5-100 nm in diameter, formed by the molten single-mode SiO 2 fiber in a CO 2 -laser-driven puller [9,10]. The tip was coated with 30-100 nm gold, side-evaporated onto the rotating fiber.…”

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confidence: 99%

Collection mode nano‐Raman setup

Zavalin

Cricenti

Generosi

et al. 2005

phys. stat. sol. (c)

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PACS 68.37. Uv, 78.30.Hv, 81.05.Je With confocal Raman microscopy, detailed images of the three-dimensional structure of thick samples (such as porous materials, aggregated nanoparticles etc.) could be readily acquired and visualized with sub-micron resolution. However, confocal Raman microscopy is not a panacea, especially for the studies of nanostructures, mainly because of diffraction limits for the optical resolution. The spatial resolution of Raman systems employing traditional optical microscopes is limited to approximately the wavelength of the light (about 0.5 µm), because both the illuminating laser light and the Raman scattered light are collected in the optical far-field (i.e. many wavelengths of light away from the scattering material). We will describe a new setup for nano-Raman experiments by using the fiber-optic scanning probe of a Scanning Near Field Optical Microscope (SNOM). The collected Raman signal in this near-field geometry reaches spatial resolutions at the level of tens of nanometers.1 Introduction With Raman microscopy, detailed images of thick and thin samples (such as porous materials, aggregated nanoparticles, stressed areas [1], etc.) could be readily acquired and visualized with sub-micron resolution. However, confocal Raman microscopy (called also a micro-Raman) is not a panacea, especially for the studies of nano-structures, mainly because of diffraction limits for the optical resolution. The spatial resolution of Raman systems employing traditional optical microscopes is limited to approximately the wavelength of the light (about 0.5 µm), because both the illuminating laser light and the Raman scattered light are collected in the optical far-field (i.e. many wavelengths of light away from the scattering material). The results, demonstrated in this paper, show using the fiber-optic scanning probe with a tapered end of 50 nm in diameter or less allows to collect Raman signal in the near-field geometry and to reach lateral spatial resolutions at the level of tens of nanometers, which is agreed with other published works (for example, review in papers [2,3]). Our scheme allows using different SNOM modes (collection and combined collection/illumination) in one setup, which is new, compare to schemes cited in review [2].Two configurations of SNOM setup can be used: with or without aperture. In the apertureless Raman SNOM method [4,5], a sharp metallic tip or nanoparticle produces the Surface-Enhanced Raman Scattering (SERS) in the near-field zone. The imaging is obtained by scanning the tip, therefore the SERS zone across the sample surface. Though this method relatively easy to implement using regular AFM scanners in combination with confocal Raman microscope, it has significant disadvantage. The processes of the SERS are not well understood and are not studied enough to use them broadly as an industrial tool for the measurements [6]. The confocal microscope takes scattered signal from larger area, wherefore to

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Optical nanospectroscopy study of ion-implanted silicon and biological growth medium

Cited by 9 publications

References 9 publications

Spectroscopic infrared scanning near-field optical microscopy (IR-SNOM)

Spectroscopic infrared scanning near-field optical microscopy (IR-SNOM)

Ultra small clusters of gold nanoshells detected by SNOM

Collection mode nano‐Raman setup

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