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Journal articles on the topic 'Berreman mode'

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Published: 10 December 2022
Last updated: 28 January 2023

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1

Vassant, Simon, Jean-Paul Hugonin, Francois Marquier, and Jean-Jacques Greffet. "Berreman mode and epsilon near zero mode." Optics Express 20, no. 21 (October 4, 2012): 23971. http://dx.doi.org/10.1364/oe.20.023971.

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2

Dunkelberger, Adam D., Daniel C. Ratchford, Andrea B. Grafton, Vanessa M. Breslin, Elizabeth S. Ryland, D. Scott Katzer, Kenan P. Fears, et al. "Ultrafast Active Tuning of the Berreman Mode." ACS Photonics 7, no. 1 (December 12, 2019): 279–87. http://dx.doi.org/10.1021/acsphotonics.9b01578.

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3

Khan, Irfan, Zhaoyuan Fang, Milan Palei, Junchi Lu, Leland Nordin, Evan L. Simmons, Owen Dominguez, et al. "Engineering the Berreman mode in mid-infrared polar materials." Optics Express 28, no. 19 (September 10, 2020): 28590. http://dx.doi.org/10.1364/oe.401733.

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4

Almossalami, Hossam A., Jun Zheng, Qili Hu, Sen Liang, Kuan-An Chen, and Hui Ye. "Sub-bandgap light absorption enhancement in germanium films through Berreman mode weak coupling to a microcavity mode." Optics Express 29, no. 26 (December 17, 2021): 44189. http://dx.doi.org/10.1364/oe.445626.

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5

Scherübl, Th, and L. K. Thomas. "Infrared Reflection Absorption Spectroscopy of Naturally Grown Oxide Films on Chrome and the Dependence of the Berreman Effect on Film Thickness." Applied Spectroscopy 51, no. 6 (June 1997): 844–48. http://dx.doi.org/10.1366/0003702971941124.

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The thickness dependence of the Berreman effect for naturally grown oxide films on chrome is analyzed theoretically and experimentally. The shift of the spectral position of the Berreman minimum can be described by the Fuchs–Kliewer theory of virtual modes. Both the absorption and the shift of the position can be used for thickness determination. The experimental results compared with calculated values based on different optical constants for Cr2O3 indicate their influence on the position and the absorption of the Berreeman minimum.
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6

Chen, Yu-Bin, and Feng-Cheng Chiu. "Trapping mid-infrared rays in a lossy film with the Berreman mode, epsilon near zero mode, and magnetic polaritons." Optics Express 21, no. 18 (August 28, 2013): 20771. http://dx.doi.org/10.1364/oe.21.020771.

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7

Shaykhutdinov, Timur, Andreas Furchner, Jörg Rappich, and Karsten Hinrichs. "Mid-infrared nanospectroscopy of Berreman mode and epsilon-near-zero local field confinement in thin films." Optical Materials Express 7, no. 10 (September 25, 2017): 3706. http://dx.doi.org/10.1364/ome.7.003706.

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8

Shioya, Nobutaka, Shingo Norimoto, Naoki Izumi, Miyako Hada, Takafumi Shimoaka, and Takeshi Hasegawa. "Optimal Experimental Condition of IR pMAIRS Calibrated by Using an Optically Isotropic Thin Film Exhibiting the Berreman Effect." Applied Spectroscopy 71, no. 5 (July 8, 2016): 901–10. http://dx.doi.org/10.1177/0003702816658673.

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Infrared (IR) p-polarized multiple-angle incidence resolution spectrometry (pMAIRS) is a useful spectroscopic tool for revealing the molecular anisotropic structure in a thin film, which is used for the molecular orientation analysis of many functionalized organic thin films. Infrared pMAIRS provides both in-plane (IP) and out-of-plane (OP) vibrational mode spectra, which are influenced by the choice of the angles of incidence, i.e., angle set. To obtain quantitatively reliable pMAIRS spectra, therefore, the optimal angle set must be revealed. In a former study, an optimization study was carried out on a silicon substrate by using the band intensity ratio of the IP and OP spectra of highly oriented molecules in a thin film, which has a problem that the optimized results cannot be used for another substrate. In the present study, a totally new idea using an optically isotropic thin film as a standard sample is proposed to comprehensively explore the optimal angle set on various substrates: the band shift due to the Berreman effect of a strongly absorbing compound is used, instead of the band intensity. This new approach makes the pMAIRS calibration for various substrates a much easier task. With the optimal angle set, the molecular orientation angle in the film calculated by the pMAIRS spectra is also found to be reliable quantitatively. This technique opens a user-friendly way to a reliable molecular orientation analysis in an ultrathin film using IR pMAIRS.
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9

Newman, Ward D., Cristian L. Cortes, Jon Atkinson, Sandipan Pramanik, Raymond G. DeCorby, and Zubin Jacob. "Ferrell–Berreman Modes in Plasmonic Epsilon-near-Zero Media." ACS Photonics 2, no. 1 (December 12, 2014): 2–7. http://dx.doi.org/10.1021/ph5003297.

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10

Bichri, A., J. Lafait, H. Welsch, and M. Abd-Lefdil. "Characterization of Berreman modes in metal/dielectric and multilayers." Journal of Physics: Condensed Matter 9, no. 31 (August 4, 1997): 6523–32. http://dx.doi.org/10.1088/0953-8984/9/31/006.

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11

Dumelow, Thomas. "Prediction of Berreman-like magnon-polariton modes in antiferromagnetic films." Journal of Physics: Condensed Matter 10, no. 35 (September 7, 1998): 7809–22. http://dx.doi.org/10.1088/0953-8984/10/35/013.

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12

Remesh, Ghanasyam, Pravin Vaity, Venu Gopal Achanta, and Subhasish Dutta Gupta. "Exploring the route from leaky Berreman modes to bound states in continuum." Optics Communications 498 (November 2021): 127223. http://dx.doi.org/10.1016/j.optcom.2021.127223.

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13

Passler, Nikolai Christian, I. Razdolski, D. Scott Katzer, D. F. Storm, Joshua D. Caldwell, Martin Wolf, and Alexander Paarmann. "Second Harmonic Generation from Phononic Epsilon-Near-Zero Berreman Modes in Ultrathin Polar Crystal Films." ACS Photonics 6, no. 6 (June 3, 2019): 1365–71. http://dx.doi.org/10.1021/acsphotonics.9b00290.

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14

Sarukhanyan, Tatevik M., Hermine Gharagulyan, Mushegh S. Rafayelyan, Sergey S. Golik, Ashot H. Gevorgyan, and Roman B. Alaverdyan. "Multimode Robust Lasing in a Dye-Doped Polymer Layer Embedded in a Wedge-Shaped Cholesteric." Molecules 26, no. 19 (October 8, 2021): 6089. http://dx.doi.org/10.3390/molecules26196089.

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Cholesteric liquid crystals (CLCs) with induced defects are one of the most prominent materials to realize compact, low-threshold and tunable coherent light sources. In this context, the investigation of optical properties of induced defect modes in such CLCs is of great interest. In particular, many studies have been devoted to the spectral control of the defect modes depending on their thickness, optical properties, distribution along the CLC, etc. In this paper, we investigate the lasing possibilities of a dye-doped polymer layer embedded in a wedge-shaped CLC. We show that multimode laser generation is possible due to the observed multiple defect modes in the PBG that enlarges the application range of the system. Furthermore, our simulations based on a Berreman 4 × 4 matrix approach for a wide range of CLC thickness show both periodic and continuous generation of defect modes along particular spectral lines inside the PBG. Such a robust spectral behaviour of induced defect modes is unique, and, to our knowledge, is not observed in similar CLC-based structures.
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15

Yu, Nan, Guo Ying Li, and Zi Qiang Huang. "View Angle Characters of the Chiral HAN-Mode LCD." Advanced Materials Research 291-294 (July 2011): 2561–65. http://dx.doi.org/10.4028/www.scientific.net/amr.291-294.2561.

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Calculation of the LCD director and transmission based on the continuous elastic theory, difference iterative method, and the Berreman’s 4×4 matrix method is shown. The realization of this procedure is in Visual C + +. We made a Visual C + + and Matlab interface to achieve the call of the required function out of Matlab. In the case of TN-type LCD, the software has been validated to be correct and reliable. The chiral HAN-mode was described by our laboratory which characteristics were not clear. Transmission has been calculated by using the software with different parameters. The results of the contrast - viewing angle curves show that: the chiral HAN-mode liquid crystal display can achieve wide prospective. We found the optimal setting parameters: Δnd = 0.48μm, p0 = 5 μm, any wavelength of visible light, and the polarizer angle =90° to achieve wide prospective from -85 ° to 85° in the horizontal direction.
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16

Talwar, Devki N., and Hao-Hsiung Lin. "Assessing thermodynamical properties of Al1−xGaxSb alloys and optical modes for Al1−xGaxSb/GaAs epifilms and (AlSb)m/(GaSb)n superlattices." Journal of Vacuum Science & Technology A 40, no. 3 (May 2022): 032801. http://dx.doi.org/10.1116/6.0001611.

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A generalized Green's function (GF) theory is adopted in the framework of a realistic rigid-ion-model (RIM) to assess the composition, x-dependent lattice dynamics, and thermodynamical characteristics of ideal random Al1−xGaxSb alloys. For simulating phonons, the alloy parameters are achieved by interpolating the values of the RIM force constants between AlSb and GaSb without requiring any additional interactions. The outcomes of phonon dispersions [Formula: see text], Debye temperature ΘD(T), and specific heat Cv(T) compare favorably well with the existing experimental and theoretical data. An established methodology of multilayer optics is also employed for modeling the far-infrared reflectance and transmission spectra of ultrathin GaSb/GaAs, AlSb/GaAs, Al1−xGaxSb/GaAs epilayers, and (AlSb)m/(GaSb)n/GaAs superlattices at near normal (θi = 0) incidence and oblique (θi ≠ 0) incidence. An accurate appraisal of the x-dependent longitudinal-optical [[Formula: see text]] and transverse-optical [[Formula: see text]] phonon splitting by Berreman's effect, along with the calculated GF results of localized vibrational mode ( GaSb:Al) and gap mode ( AlSb:Ga), is carefully integrated into the modified-random-iso-displacement model to validate the two-phonon mode behavior in Al1−xGaxSb ternary alloys.
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17

Gric, Tatjana, and Ortwin Hess. "Investigation of Hyperbolic Metamaterials." Applied Sciences 8, no. 8 (July 25, 2018): 1222. http://dx.doi.org/10.3390/app8081222.

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Composites designed by employing metal/dielectric composites coupled to the components of the incident electromagnetic (EM) fields are named metamaterials (MMs), and they display features not observed in nature. This type of artificial media has attracted great interest, resulting in groundbreaking theory that bridges the gap between EM and photonic phenomena. Practical applications of MMs have been delayed due to the high losses related to the use of metallic composites, on top of the challenges in manufacturing nanoscale, three-dimensional structures. Novel materials—for instance, graphene or transparent-conducting oxides (TCOs), employed for the production of multilayered MMs—can significantly suppress undesirable losses. It is worthwhile noting that three-layered nanocomposites enable an increase in the frequency range of the surface wave. This work analyzes recent progress in the physics of multilayered MMs. We deliver an outline of key notions, such as effective medium approximation, and present multilayered MMs based on the three-layered structure. An overview of graphene multilayered MMs reveals their ability to support Ferrell–Berreman (FB) modes. We also describe the tunable properties of the multilayered MMs.
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18

Lin, Chin-Lung, and Tei-Chen Chen. "SURFACE AZIMUTHAL ANCHORING ENERGY BETWEEN THE GRATING SURFACE AND NEMATIC LIQUID CRYSTAL LAYER STUDIED BY USING A GEOMETRIC MODEL." Transactions of the Canadian Society for Mechanical Engineering 41, no. 1 (March 2017): 159–68. http://dx.doi.org/10.1139/tcsme-2017-1011.

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A simple geometric model is proposed for estimating the azimuthal anchoring energy between the sinusoidal relief grating surface and nematic liquid crystal layer of a liquid crystal display (LCD) device as a function of the grating height and grating pitch. The model parameters are determined experimentally, and the model is then used to predict the surface azimuthal anchoring energy for gratings with various pitches and heights. It is shown that a good agreement exists between the predicted results for the surface azimuthal anchoring energy and the experimental data. Moreover, a good agreement is also observed between the estimated results and those obtained from Berreman’s expression and finite element method (FEM) simulations, respectively. Overall, the experimental and numerical results show that for the nematic liquid crystal considered in the present study (4-n-pentyl-4’-cyanobiphenyl (5CB)), the surface azimuthal anchoring energy increases with an increasing grating height or a reducing grating pitch.
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19

Quiroz, Heiddy P., and A. Dussan. "Evidence of the Berreman effect in TiO2:Co thin layers deposited by DC magnetron Co-Sputtering: A correlation between optical properties and LO-TO splitting modes." Ceramics International 45, no. 17 (December 2019): 21208–12. http://dx.doi.org/10.1016/j.ceramint.2019.07.101.

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20

Yu, Xinlan, Jiahuan Qiu, Qili Hu, Kuan-An Chen, Jun Zheng, Sen Liang, miao Du, and hui ye. "Tunable Berreman mode in highly conductive organic thin films." Optics Express, October 31, 2022. http://dx.doi.org/10.1364/oe.472115.

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21

Khayyat Jafari, Ahmad, Matthew Gaddy, Imtiaz Ahmad, Satya Kachiraju, Md Borhan Mia, Ishtiaque Ahmed, Sergey Nikishin, Myoung-Hwan Kim, and Ayrton Bernussi. "Effects of Silicon Dioxide as the Polar Dielectric on the Infrared Absorption Spectrum of the Metal-Insulator-Metal Metasurface." Materials Research Express, December 30, 2022. http://dx.doi.org/10.1088/2053-1591/acaf4c.

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Abstract Metal-insulator-metal metasurfaces have been widely used as high-performance absorbers in almost all electromagnetic spectral range. Their absorption spectra can be engineered by making variations in the geometry of the unit cells and/or by embedding materials with specific optical constants. Including a polar dielectric in their structure is another approach for manipulating their absorption spectra. In this research, we have numerically and experimentally investigated the effect of using silicon dioxide (SiO2) as a polar dielectric on the absorption spectrum of a metal-insulator-metal metasurface composed of a tri-layer of Ni-SiO2-Ni. Our results have shown the presence of absorption peaks in the mid-infrared which are attributed to the excitation of the optical phonons in the SiO2 spacer layer. Particularly, the excitation of the Berreman mode in the SiO2 spacer layer was observed and its effect on the total absorption spectrum is studied. The parametric effects of the top patterned Ni layer, the incident angle, and the polarization are also investigated. This study can provide engineering capabilities for the mid-infrared absorbers and reflection filters.
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22

Rowell, N. L., D. J. Lockwood, P. J. Poole, and G. Yu. "Far Infrared Spectroscopy of In0.53Ga0.47As Quantum Wells on InP(100)." MRS Proceedings 744 (2002). http://dx.doi.org/10.1557/proc-744-m9.3.

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ABSTRACTPolarized far infrared reflectance was measured at oblique incidence for In0.53Ga0.47As / InP multiple quantum wells grown by chemical beam epitaxy on InP(100) wafers. Both the well thickness (0.25 - 20 nm) and number of periods (10 - 40) were varied. The reflectance spectra contained sharp Berreman modes at the frequencies of the transverse (TO) and longitudinal (LO) optical phonons. The contributions of the individual phonons were resolved with the model fits. Interface layer phonon modes were observed with intensity increasing with number of wells. The interface layers were 0.6 nm thick and of different composition to adjoining wells consistent with cross-sectional scanning tunneling microscope results on the same samples. The variation due to phonon confinement of the InAs- and GaAs-like LO and TO phonon frequencies was obtained.
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23

Pratap, Dheeraj, Jitendra Pradhan, and S. Anantha Ramakrishna. "Experimental observation of Berreman modes in uniaxial anisotropic nanoporous alumina film on aluminium substrate." Optics Letters, April 25, 2022. http://dx.doi.org/10.1364/ol.456109.

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24

Pratap, Dheeraj, Jitendra Pradhan, and S. Anantha Ramakrishna. "Experimental observation of Berreman modes in uniaxial anisotropic nanoporous alumina film on aluminium substrate." Optics Letters, April 25, 2022. http://dx.doi.org/10.1364/ol.456109.

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25

Šik, J., M. Schubert, T. Hofmann, and V. Gottschalch. "Free-carrier effects and optical phonons in GaNAs/GaAs superlattice heterostructures measured by infrared spectroscopic ellipsometry." MRS Internet Journal of Nitride Semiconductor Research 5, no. 1 (2000). http://dx.doi.org/10.1557/s109257830000003x.

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The infrared-optical properties of GaAs/GaNxAs1−x superlattice (SL) heterostructures (0 < x < 3.3%) are studied by variable angle-of-incidence infrared spectroscopic ellipsometry (IRSE) for wavenumbers from 250 cm−1 to 700 cm−1. The undoped SL structures where grown on top of a 300 nm thick undoped GaAs buffer layer on Te-doped (001) GaAs substrates by metal-organic vapor phase epitaxy (MOVPE). We observe the well-known Berreman-polariton effect within the GaAs LO-phonon region. We further observe a strong polariton-like resonance near the coupled longitudinal-optical plasmon-phonon frequency of the Te-doped substrate at 306 cm−1. For analysis of the IRSE data we employ the harmonic oscillator dielectric function model and the Drude model for free-carrier response. The additional resonance feature is explained by pseudo surface polariton (PSP) interface modes between the Te-doped GaAs and the undoped GaAs buffer layer / SL film. We find that the PSP modes are extremely sensitive to free-carrier properties within the SL structures, and we obtain a strong increase in free-carrier concentration within the GaNAs SL sublayers with increasing x from analysis of the IRSE data. We further observe the localized vibrational modes of nitrogen at 470 cm−1 in the GaNxAs1−x SL sublayers with a polar strength that increases linearly with x, and which can be used to monitor the nitrogen concentration in GaNxAs1−x.
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26

Rowell, N. L., G. Yu, D. J. Lockwood, and P. J. Poole. "Infrared Dielectric Properties of In1-xGaxAs Epilayers on InP (100)." MRS Proceedings 799 (2003). http://dx.doi.org/10.1557/proc-799-z5.25.

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ABSTRACTThe concentration dependence of optical phonons in strained In1-xGaxAs epilayers grown on InP (100) by chemical beam epitaxy has been characterized with oblique angle polarized far-infrared reflectivity measurements. In this powerful method, the reflectance spectra contain sharp Berreman peaks exactly at the optical phonon frequencies. For radiation polarized in the plane of incidence (p-polarized), peaks for both the TO and LO phonons were observed. For s-polarization only the TO modes were observed. For heavily doped substrates the TO film phonons were observed as reflectance minima, whereas for lightly doped substrates they were seen as maxima. The measured spectra were curve resolved to separate the effects of the various modes which included GaAs-like longitudinal and transverse optic (LO and TO), a disorder induced, and InAs-like LO and TO phonons. The dielectric response function and phonon frequency dependences for all modes were obtained versus Ga fraction for x from 0.25 to 0.75 and the latter showed a quadratic dependence on x over this range. The effects of strain on the phonon frequencies could then be evaluated.
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27

Fukuda, Jun-ichi, Makoto Yoneya, and Hiroshi Yokoyama. "Surface-Groove-Induced Azimuthal Anchoring of a Nematic Liquid Crystal: Berreman’s Model Reexamined." Physical Review Letters 98, no. 18 (May 4, 2007). http://dx.doi.org/10.1103/physrevlett.98.187803.

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28

Barbero, G., A. S. Gliozzi, M. Scalerandi, and L. R. Evangelista. "Generalization of Berreman’s model to the case of large amplitude of the grooves." Physical Review E 77, no. 5 (May 19, 2008). http://dx.doi.org/10.1103/physreve.77.051703.

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29

Innocenzi, Plinio, Paolo Falcaro, David Grosso, and Florence Babonneau. "Microstructural Evolution and Order-Disorder Transitions in Mesoporous Silica Films Studied by FTIR Spectroscopy." MRS Proceedings 726 (2002). http://dx.doi.org/10.1557/proc-726-q9.1.

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AbstractSilica mesoporous thin films have been synthesised with a self-assembling process employing cetyltrimethylammonium bromide as the organic template and tetraethyl orthosilicate as the silica source. Mesoporous films with Pm3n cubic phase phases have been obtained and the films have been thermally treated in air with a progressive heating schedule from asdeposited up to 1000°C. The evolution of the microstructure has been studied with transmission Fourier transformed infrared (FTIR) spectroscopy.FTIR spectra of the as-deposited films have shown the presence of cyclic species, which at temperatures larger than 350°C have been no more observed. In the 1000-1300 cm-1 region several overlapped absorption bands have been detected. In particular, the pair LO3-TO3, the cyclic species absorption bands and the pair LO4-TO4 have been resolved. These last bands, in particular, are associated with disorder-order transitions in the silica microstructure. These disorder-induced optical modes are due to the large interface area and related to bond strains.The evolution of the bands in the 1000-1300 cm-1 region has been followed with the Berreman configuration, performing the transmission FTIR analysis at 45° with respect to the normal incidence angle. The LO3 band, which in silica sol-gel films is indicative of the network condensation and is activated by scattering of the light in the pores, was resolved as a single sharp band from 250°C.
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30

Rojas-Gómez, O. A., and J. M. Romero-Enrique. "Generalized Berreman's model of the elastic surface free energy of a nematic liquid crystal on a sawtoothed substrate." Physical Review E 86, no. 4 (October 26, 2012). http://dx.doi.org/10.1103/physreve.86.041706.

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31

Fukuda, Jun-ichi, Makoto Yoneya, and Hiroshi Yokoyama. "Erratum: Surface-Groove-Induced Azimuthal Anchoring of a Nematic Liquid Crystal: Berreman’s Model Reexamined [Phys. Rev. Lett.98, 187803 (2007)]." Physical Review Letters 99, no. 13 (September 28, 2007). http://dx.doi.org/10.1103/physrevlett.99.139902.

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