Optical characterisation of semiconductor surfaces and interfaces

McGilp, J. F.

doi:10.1016/0079-6816(95)00034-v

Cited by 166 publications

(51 citation statements)

References 387 publications

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“…In contrast, the reflectance of opaque substrates can be measured and, combined with differential methods, can be sensitive to small amounts of silicon. Surface differential reflectance spectroscopy (SDRS), which provides the relative change in reflectance of the sample due to the presence of additional atoms or molecules on the surface, has been shown to be an efficient technique to study adsorption phenomena [18,19], growth of very thin films on such substrates [20][21][22], and also to follow their kinetics [23,24].…”

Section: Introductionmentioning

confidence: 99%

Large differences in the optical properties of a single layer of Si on Ag(110) compared to silicene

2014

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The optical properties of Si nanoribbons grown on Ag(110) under ultrahigh vacuum have been experimentally determined by use of in situ surface differential reflectance spectroscopy. Real-time measurements showed a clear transition of the optical response of the Si deposit at full coverage of the Ag(110) surface, corresponding to 0.8 monolayer of silicon. The spectra measured for the complete self-assembled nanoribbon layer are different from the reflectance spectrum calculated for a layer of silicene on silver, which rules out the possible silicenelike character of this layer. Furthermore, the dielectric function of the nanoribbons is calculated from the experimental data and is similar to the one of amorphous silicon, with a red shift of about 0.6 to 0.8 eV of the main absorption feature. This result indicates that the Si nanoribbons display a preferential sp 3 hybridization as in amorphous Si and not a partial sp 2 hybridization as expected for silicene.

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Section: Introductionmentioning

confidence: 99%

Large differences in the optical properties of a single layer of Si on Ag(110) compared to silicene

2014

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“…where α is the polarization vector angle of the linearly polarized light with respect to the plane of incidence [15]. The SH response is fitted to Eqs.…”

Section: Theory and Shg Phenomenologymentioning

confidence: 99%

“…Surface and interface sensitive optical techniques offer advantages in this area over conventional surface science techniques. Specifically, all pressure ranges of gas-solid interfaces are accessible, the material damage and contamination associated with charged particle probes is eliminated, and insulating substrates can be studied without the problem of charging effects [15]. For example, it has been shown recently that reflection anisotropy spectroscopy (RAS), a surface sensitive form of polarized reflectance, is a particularly useful in situ probe of Ag NP growth on faceted Al 2 O 3 [7,16], while spectroscopic ellipsometry combined with analytic modelling of the optical response also appears promising [17,18].…”

Section: Introductionmentioning

confidence: 99%

Optical characterisation of plasmonic nanostructures on planar substrates using second–harmonic generation

et al. 2015

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Abstract:Off-normal, polarization dependent second-harmonic generation (SHG) measurements were performed ex situ on plasmonic nanostructures grown by self-assembly on nanopatterned templates. These exploratory studies of Ag nanoparticle (NP) arrays show that the sensitivity of SHG to the local fields, which are modified by the NP size, shape and distribution, makes it a promising fixed wavelength characterization technique that avoids the complexity of spectroscopic SHG. The off-normal geometry provides access to the out-of-plane SH response, which is typically an order-of-magnitude larger than the in-surface-plane response measured using normal incidence, for example in SHG microscopy. By choosing the plane of incidence orthogonal to the NP array direction, it was shown that the p−polarized SH response, as a function of input polarization, is very sensitive to NP morphology, with a change of 20% in the aspect ratio of the NPs producing a variation of a factor of 30 in the easily measureable ratio of the p−polarized SH field strength for s− and p−polarized input. The results show that such a fixed geometry could be used for the in situ characterization of anisotropic nanostructure morphology during growth by self-assembly, which could be particularly useful in situations where rotating the sample may be neither desirable nor easily accomplished. Rep. 408, 131-314 (2005). 34. G. Bachelier and J. Butet and I. Russier-Antoine and C. Jonin and E.Benichou and P. F. Brevet, "Origin of optical second-harmonic generation in spherical gold nanoparticles: local surface and nonlocal bulk contributions," Phys.

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“…(12), we find (13) with (14) with and are given by Eq. (10) , such that the reflection from such a system is given by (15) (16) Here is found iteratively using the following equations,…”

Section: Effective-substrate Approach To Optical Reflection Frommentioning

confidence: 99%

“…Optical reflection techniques such as ellipsometry [1][2][3][4][5][6], surface plasmon polariton wave excitation [7][8][9][10][11], spectral interferometry [12][13][14], reflection anisotropy spectroscopy [15,16] and surface photo-absorption [17], are widely used to monitor processes at surfaces and interfaces of solids. They are desirable for versatility, non-invasiveness, and ease of implementation.…”

Section: Introductionmentioning

confidence: 99%

Effective-substrate theory for optical reflection from a layered substrate

et al. 2008

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We show that reflection of a monochromatic light from a semi-infinite medium covered with a stack of layered media is equivalent to that from an effective "semi-infinite medium" characterized by two distinctive optical dielectric constants for the s-polarized and p-polarized components, respectively. Such an effective-substrate approach simplifies the analysis of ellipsometry measurements of a wide range of surface-bound processes including thin film growth and surface-bound reactions.

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Optical characterisation of semiconductor surfaces and interfaces

Cited by 166 publications

References 387 publications

Large differences in the optical properties of a single layer of Si on Ag(110) compared to silicene

Large differences in the optical properties of a single layer of Si on Ag(110) compared to silicene

Optical characterisation of plasmonic nanostructures on planar substrates using second–harmonic generation

Effective-substrate theory for optical reflection from a layered substrate

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