超高速显微拉曼成像光谱仪

RIMA激光拉曼显微成像系统

RIMA拉曼显微高光谱成像系统

Photon etc公司RIMA拉曼成像技术是新一代快速、高精度、面扫描激光拉曼技术，它将共聚焦显微技术与激光拉曼光谱技术完美结合，与传统的点成像拉曼系统不同，采用面成像技术，将激光扩束后，用特殊的光学元件将扩束后的高斯分布的激光整形成均匀分布的平顶激光，照射在样品上，滤除反射的激光后，所有激发的拉曼光和再通过可调滤波器为主的高光谱成像组件，成像在ccd上，可在几分钟内完成，以相元为单位，可以形成高达十万组拉曼光谱数据。是目前市面上zei快的拉曼成像设备.

1.      快速global mapping（非扫描式）

2.      百万像素拉曼光谱，成像时间仅几分钟

3.      斯托克斯和反斯托克斯

4.      高光谱分辨率和空间分辨率

拉曼成像系统，，激光拉曼成像光谱仪， 拉曼光谱仪，拉曼成像高光谱，激光拉曼高光谱成像系统，激光拉曼高光谱成像仪，RAMAN imagingsystem，RAMAN spectrometer，RAMAN spectral system

Photon etc公司RIMA拉曼成像技术是新一代快速、高精度、面扫描激光拉曼技术，它将共聚焦显微技术与激光拉曼光谱技术完美结合，与传统的点成像拉曼系统不同，采用面成像技术，将激光扩束后，用特殊的光学元件将扩束后的高斯分布的激光整形成均匀分布的平顶激光，照射在样品上，滤除反射的激光后，所有激发的拉曼光和再通过可调滤波器为主的高光谱成像组件，成像在ccd上，可在几分钟内完成，以相元为单位，可以形成高达十万组拉曼光谱数据。是目前市面上zei快的拉曼成像设备。

产品特点

1.      快速global mapping（非扫描式）

2.      百万像素拉曼光谱，成像时间仅几分钟

3.      斯托克斯和反斯托克斯

4.      高光谱分辨率和空间分辨率

设备原理图：

系统参数：

应用领域：

单层石墨烯鉴别

Graphene,  one of the most popular allotropes of carbon, has sparked broad  interest in the field of material science since it was first isolated in  2004 by Professors Geim and Novoselov (University of Manchester).  Curren tly, the synthesis of large-scale  graphene on copper surfaces by chemical vapor deposition (CVD) is being  explored by the scientific community. Despite considerable efforts, CVD  graphene in different growth conditions exhibits various morphologies  such as the presence of hillocks, defects, grain boundaries and  multilayer island formation, effects which researchers are attempting to  mitigate. But to be able toexhaustively study the  composition of these samples, hyperspectral Raman imaging was required,  and was carried out on CVD monolayer graphene with bilayer islands.  Raman spectroscopy is a non-destructive analysis method that provides  microscopic structural information by comparing a sample’s spectrum with  reference spectra. Here, we present selected results from Prof.  Martel’s group at Université de Montréal obtained during the  investigation of the formation of graphene multilayer islands during  Chemical Vapor Deposition growth with methane as feedstock. Known Raman  signatures of the different configurations of graphene were used in this  study to map the number of layers of the samples.

Raman  imaging was performed with the hyperspectral Raman imaging platform  RIMA™ based on Bragg tunable filter technology. In these measurements, a  CW laser at λ = 532 nm illuminated 130 × 130 μm² and 260 × 260 μm² sample  surface areas through 100X and 50X microscope objectives respectively.  In this configuration, the sample was excited with 120 μW/μm²  and 30 μW/μm² and the resolution was diffraction limited.

FIG. 1 (a) presents a 130 × 130 μm² Raman map of graphene’s G band (∼1590 cm^-1)  in three different families: monolayer graphene (blue), bilayer  graphene in resonance (red) and bilayer graphene out of resonance  (green). Their typical associated Raman spectra are presented in FIG. 1  (b-c). The intensity variations of the G band reveal information on the  stacking of the layers. The most significant changes in intensity  observed in FIG. 1 (b) can be explained by resonance resulting from the  twisted angle (13.5° at λ_exc = 532 nm [1])  of the bilayer graphene. FIG. 1 (d-f) presents similar results as in  FIG. 1 (a-c), but data were acquired from a larger area: 260 × 260 μm².  The intrinsic specificity of Raman scattering combined with global  imaging capabilities allows users to assess large maps (hundreds of  microns) of defects, number of layers and stacking order, etc.

纳米材料分析

Global  Raman imaging is an exceptional technique for the analysis of large  surfaces of thin films and advanced materials. Its rapidity makes it a  great tool not only for universities and research institutes, but also  for industrial laboratories. With no or minimal sample preparation, RIMA™,  Photon etc.’s new hyperspectral Raman imager, can easily take part in  routine analysis, where the prompt access to information about sample  composition is crucial for the development of new materials.

With  systems based on point-to-point or scanning technologies, the  acquisition of maps of large areas is often tedious and time consuming:  the analysis of a sample may take hours. RIMA™ expedites in minutes the  acquisition of the whole area in the field of view, rendering full maps  of a sample with unmatched rapidity. In fact, the hyperspectral cube is  built image by image, along the spectral window of interest, with a  spectral resolution better than 7 cm­-1. Since a spectrum is recorded  for each pixel, it is possible, with a 1024 x 1024 pixels camera, to  collect more than one million spectra without moving the sample.  Moreover, the size of the maps can be as large as 650 x 650 mm2,  depending on the magnification of the objective used for the analysis.  Photon etc.’s filters used for hyperspectral imaging are based on  holographic gratings, and provide very high efficiency for an optimal  acquisition of the weak Raman scattering. Combined with top of the line  low noise CCD or EMCCD cameras, RIMA™ is the most efficient Raman  imaging system on the market.

In  order to show the advantages of RIMA™ in the analysis of nanomaterials  in biological systems, carbon nanotubes (CNT) have been incubated with a  sample of Candida Albicans yeast cells and exposed to a  homogeneous (flat-top) laser excitation of 532 nm on the entire field of  view. With a 50X objective, an area of 260 x 130 μm2 was imaged, with a  step of 4.5 cm­-1 and an exposition time of 15 s. The complete analysis  took 20 minutes, for a total of more than 60,000 spectra.

Figure  1 shows the Raman hyperspectral cube of a portion of the imaged area  containing the yeast. The monochromatic Raman images revealed the  position of the aggregated yeast cells stained with the CNTs. The  typical signal of CNTs (red line) confirmed their presence on the yeast  cells, while in other areas the hyperspectral camera did not detect any  CNT Raman signal (blue line).

Raman Multiplexing

DEVELOPMENT  AND CHARACTERIZATION OF CARBON NANOTUBE BASED RAMAN NANOPROBES BY RAMAN  HYPERSPECTRAL IMAGING: MULTIPLEXING AND BIODETECTION

The potential of Photon etc. Raman Imaging Platform, RIMA™, was demonstrated by Pr. R Martel’s group at Université de Montréal in a recent publication in Nature Photonics on the development of Raman nanoprobes [1].

These  new kind of nanoprobes are based on single-wall carbon nanotubes and  J-aggregated dyes, such as α−sexithiophene (6T), β-carotene (βcar) and  phenazine (Ph). Compared to fluorescent probes, Raman probes have the  advantages of being more stable over long periods of times (weeks and  years) and they produce a unique signature with narrow peaks that allows  easy multiplexing of 3 probes or more using the same excitation laser  energy. This nanomaterial shows a very high Raman scattering  cross-section, without any photobleaching or fluorescence background,  even at high laser intensities.

In  this work RIMA™ enabled the imaging and multiplexing of three different  probes with sensitivity down to the single object as seen in Figure 1.   The different probes were deposited on a SiOx/Si surface and  characterized by taking a single hyperspectral image. We were able to  determine, without a doubt, the position of each isolated probe  (diameters: 1.3 ± 0.2 nm), and even identify the co-localized probes  (Fig 1b, Ph and βcar). The sensitivity, efficiency and hyperspectral  properties of RIMA™ were essential to the development of these probes.

The  carbon nanotube, which serves as a capsule for the probe, can be  covalently functionalized to selectively target biomolecules, such as  streptavidin. We demonstrated RIMA™’s potential in the detection of  probes in a biological context by imaging the βcar probe functionalized  with PEG-biotin groups that targeted streptavidin.

A  pattern of 10 μm spots of streptavidin was created by microcontact  printing and then incubated with the probes. The pattern was maintained  hydrated under a cover slip during imaging and the probes were detected  where streptavidin was located. Figure 2 shows Raman hyperspectral  images at 1520 cm-1 of two printed surfaces, where streptavidin was  deposited either inside (main figure) or around the dots (inset). With a  single acquisition, a sample area of 133 x 133 μm2 was studied using  RIMA™ with laser excitation at 532 nm. Damages to the samples were also  limited due to a uniform illumination over the portion of the sample in  the field of view. In terms of spectral resolution and large surface  area imaged, RIMA™ provided hyperspectral images in a much shorter time  then conventional point-by-point mapping Raman imagers.

Raman  hyperspectral imaging is a powerful technique to study a wide range of  materials, from nanopatterned surfaces to biological systems. Because of  its high throughput, RIMA™ allows the acquisition of spectrally  resolved maps of large area samples, without damaging the surface.

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