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Vasileva, E., Baitenov, A., Chen, H., Li, Y., Sychugov, I., Yan, M., . . . Popov, S. (2019). Effect of transparent wood on the polarization degree of light. Optics Letters, 44(12), 2962-2965
Open this publication in new window or tab >>Effect of transparent wood on the polarization degree of light
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2019 (English)In: Optics Letters, ISSN 0146-9592, E-ISSN 1539-4794, Vol. 44, no 12, p. 2962-2965Article in journal (Refereed) Published
Abstract [en]

We report on the study of polarization properties of light propagating through transparent wood (TW), which is an anisotropically scattering medium, and consider two cases: completely polarized and totally unpolarized light. It was demonstrated that scattered light distribution is affected by the polarization state of incident light. Scattering is the most efficient for light polarized parallel to cellulose fibers. Furthermore, unpolarized light becomes partially polarized (with a polarization degree of 50%) after propagating through the TW. In the case of totally polarized incident light, however, the degree of polarization of transmitted light is decreased, in an extreme case to a few percent, and reveals an unusual angular dependence on the material orientation. The internal hierarchical complex structure of the material, in particular cellulose fibrils organized in lamellae, is believed to be responsible for the change of the light polarization degree. It was demonstrated that the depolarization properties are determined by the angle between the polarization of light and the wood fibers, emphasizing the impact of their internal structure, unique for different wood species.

Place, publisher, year, edition, pages
OPTICAL SOC AMER, 2019
National Category
Atom and Molecular Physics and Optics
Identifiers
urn:nbn:se:kth:diva-255191 (URN)10.1364/OL.44.002962 (DOI)000471636700005 ()31199356 (PubMedID)2-s2.0-85067943575 (Scopus ID)
Note

QC 20190904

Available from: 2019-09-04 Created: 2019-09-04 Last updated: 2019-09-04Bibliographically approved
Medina, L., Nishiyama, Y., Daicho, K., Saito, T., Yan, M. & Berglund, L. (2019). Nanostructure and Properties of Nacre-Inspired Clay/Cellulose Nanocomposites—Synchrotron X-ray Scattering Analysis. Macromolecules, 52(8), 3131-3140
Open this publication in new window or tab >>Nanostructure and Properties of Nacre-Inspired Clay/Cellulose Nanocomposites—Synchrotron X-ray Scattering Analysis
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2019 (English)In: Macromolecules, ISSN 0024-9297, E-ISSN 1520-5835, Vol. 52, no 8, p. 3131-3140Article in journal (Refereed) Published
Abstract [en]

Nacre-inspired clay nanocomposites have excellent mechanical properties, combined with optical transmittance, gas barrier properties, and fire retardancy, but the mechanical properties are still below predictions from composite micromechanics. The properties of montmorillonite clay/nanocellulose nanocomposite hybrids are investigated as a function of clay content and show a maximum Young’s modulus as high as 28 GPa. Ultimate strength, however, decreases from 280 to 125 MPa between 0 and 80 wt % clay. Small-angle and wide-angle X-ray scattering data from synchrotron radiation are analyzed to suggest nanostructural and phase interaction factors responsible for these observations. Parameters discussed include effective platelet modulus, platelet out-of-plane orientation distribution, nanoporosity, and platelet agglomeration state.

Place, publisher, year, edition, pages
American Chemical Society (ACS), 2019
National Category
Composite Science and Engineering Paper, Pulp and Fiber Technology Nano Technology
Research subject
Fibre and Polymer Science
Identifiers
urn:nbn:se:kth:diva-249608 (URN)10.1021/acs.macromol.9b00333 (DOI)000466053200022 ()
Funder
Knut and Alice Wallenberg FoundationSwedish Foundation for Strategic Research , RMA11-0065
Note

QC 20190521

Available from: 2019-04-12 Created: 2019-04-12 Last updated: 2019-10-24Bibliographically approved
Chen, H., Baitenov, A., Li, Y., Vasileva, E., Popov, S., Sychugov, I., . . . Berglund, L. (2019). Thickness Dependence of Optical Transmittance of Transparent Wood: Chemical Modification Effects. ACS Applied Materials and Interfaces, 11(38), 35451-35457
Open this publication in new window or tab >>Thickness Dependence of Optical Transmittance of Transparent Wood: Chemical Modification Effects
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2019 (English)In: ACS Applied Materials and Interfaces, ISSN 1944-8244, E-ISSN 1944-8252, Vol. 11, no 38, p. 35451-35457Article in journal (Refereed) Published
Abstract [en]

Transparent wood (TW) is an emerging optical material combining high optical transmittance and haze for structural applications. Unlike nonscattering absorbing media, the thickness dependence of light transmittance for TW is complicated because optical losses are also related to increased photon path length from multiple scattering. In the present study, starting from photon diffusion equation, it is found that the angle-integrated total light transmittance of TW has an exponentially decaying dependence on sample thickness. The expression reveals an attenuation coefficient which depends not only on the absorption coefficient but also on the diffusion coefficient. The total transmittance and thickness were measured for a range of TW samples, from both acetylated and nonacetylated balsa wood templates, and were fitted according to the derived relationship. The fitting gives a lower attenuation coefficient for the acetylated TW compared to the nonacetylated one. The lower attenuation coefficient for the acetylated TW is attributed to its lower scattering coefficient or correspondingly lower haze. The attenuation constant resulted from our model hence can serve as a singular material parameter that facilitates cross-comparison of different sample types, at even different thicknesses, when total optical transmittance is concerned. The model was verified with two other TWs (ash and birch) and is in general applicable to other scattering media.

Place, publisher, year, edition, pages
AMER CHEMICAL SOC, 2019
Keywords
transparent wood, transmittance, photon diffusion equation, attenuation coefficient, anisotropic scattering
National Category
Physical Sciences
Identifiers
urn:nbn:se:kth:diva-262791 (URN)10.1021/acsami.9b11816 (DOI)000488322900100 ()31483595 (PubMedID)2-s2.0-85072687041 (Scopus ID)
Note

QC 20191022

Available from: 2019-10-22 Created: 2019-10-22 Last updated: 2019-10-22Bibliographically approved
Li, Y., Yang, X., Fu, Q., Rojas, R., Yan, M. & Berglund, L. (2018). Towards centimeter thick transparent wood through interface manipulation. Journal of Materials Chemistry A, 6(3), 1094-1101
Open this publication in new window or tab >>Towards centimeter thick transparent wood through interface manipulation
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2018 (English)In: Journal of Materials Chemistry A, ISSN 2050-7488, Vol. 6, no 3, p. 1094-1101Article in journal (Refereed) Published
Abstract [en]

Transparent wood is an attractive structural material for energy-saving buildings due to its high optical transmittance, good thermal insulation, and high toughness. However, thick highly transparent wood is challenging to realize. In the current work, highly transparent wood (1.5 mm) with a transmittance of 92%, close to that of pure PMMA (95%), is demonstrated. The high transmittance was realized by interface manipulation through acetylation of wood template. Both experiments and electromagnetic modeling support that the improved transmittance is mainly due to elimination of interface debonding gap. By applying this method, a centimeter-thick transparent wood structure was obtained. The transparent wood could be used as a substrate for an optically tunable window by laminating a polymer dispersed liquid crystal (PDLC) film on top. The techniques demonstrated are a step towards the replacement of glass in smart windows and smart buildings.

Place, publisher, year, edition, pages
ROYAL SOC CHEMISTRY, 2018
National Category
Composite Science and Engineering
Identifiers
urn:nbn:se:kth:diva-222182 (URN)10.1039/c7ta09973h (DOI)000422949700040 ()2-s2.0-85040915327 (Scopus ID)
Note

QC 20180206

Available from: 2018-02-06 Created: 2018-02-06 Last updated: 2018-02-06Bibliographically approved
Fu, Q., Yan, M., Jungstedt, E., Yang, X., Li, Y. & Berglund, L. A. (2018). Transparent plywood as a load-bearing and luminescent biocomposite. Composites Science And Technology, 164, 296-303
Open this publication in new window or tab >>Transparent plywood as a load-bearing and luminescent biocomposite
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2018 (English)In: Composites Science And Technology, ISSN 0266-3538, E-ISSN 1879-1050, Vol. 164, p. 296-303Article in journal (Refereed) Published
Abstract [en]

Transparent wood (TW) structures in research studies were either thin and highly anisotropic or thick and isotropic but weak. Here, transparent plywood (TPW) laminates are investigated as load-bearing biocomposites with tunable mechanical and optical performances. Structure-property relationships are analyzed. The plies of TPW were laminated with controlled fiber directions and predetermined stacking sequence in order to control the directional dependence of modulus and strength, which would give improved properties in the weakest direction. Also, the angular dependent light scattering intensities were investigated and showed more uniform distribution. Luminescent TPW was prepared by incorporation of quantum dots (QDs) for potential lighting applications. TPW can be designed for large-scale use where multiaxial load-bearing performance is combined with new optical functionalities.

Place, publisher, year, edition, pages
Elsevier, 2018
Keywords
Transparent Wood, Nanotechnology, Biocomposite, Photonics
National Category
Composite Science and Engineering
Identifiers
urn:nbn:se:kth:diva-233274 (URN)10.1016/j.compscitech.2018.06.001 (DOI)000440121700036 ()2-s2.0-85048381154 (Scopus ID)
Funder
EU, European Research Council, 742733
Note

QC 20180821

Available from: 2018-08-21 Created: 2018-08-21 Last updated: 2018-08-21Bibliographically approved
Li, Y., Fu, Q., Rojas, R., Yan, M., Lawoko, M. & Berglund, L. (2017). Lignin-Retaining Transparent Wood. ChemSusChem, 10(17), 3445-3451
Open this publication in new window or tab >>Lignin-Retaining Transparent Wood
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2017 (English)In: ChemSusChem, ISSN 1864-5631, E-ISSN 1864-564X, Vol. 10, no 17, p. 3445-3451Article in journal (Refereed) Published
Abstract [en]

Optically transparent wood, combining optical and mechanical performance, is an emerging new material for light-transmitting structures in buildings with the aim of reducing energy consumption. One of the main obstacles for transparent wood fabrication is delignification, where around 30wt% of wood tissue is removed to reduce light absorption and refractive index mismatch. This step is time consuming and not environmentally benign. Moreover, lignin removal weakens the wood structure, limiting the fabrication of large structures. A green and industrially feasible method has now been developed to prepare transparent wood. Up to 80wt% of lignin is preserved, leading to a stronger wood template compared to the delignified alternative. After polymer infiltration, a high-lignin-content transparent wood with transmittance of 83%, haze of 75%, thermal conductivity of 0.23WmK(-1), and work-tofracture of 1.2MJm(-3) (a magnitude higher than glass) was obtained. This transparent wood preparation method is efficient and applicable to various wood species. The transparent wood obtained shows potential for application in energy-saving buildings.

Place, publisher, year, edition, pages
WILEY-V C H VERLAG GMBH, 2017
Keywords
building materials, delignification, energy saving, lignin, wood
National Category
Composite Science and Engineering
Identifiers
urn:nbn:se:kth:diva-214873 (URN)10.1002/cssc.201701089 (DOI)000410136800018 ()2-s2.0-85029175474 (Scopus ID)
Note

QC 20171024

Available from: 2017-10-24 Created: 2017-10-24 Last updated: 2019-10-29Bibliographically approved
Dai, J., Ding, F., Bozhevolnyi, S. I. & Yan, M. (2017). Ultrabroadband super-Planckian radiative heat transfer with artificial continuum cavity states in patterned hyperbolic metamaterials. Physical Review B, 95(24), Article ID 245405.
Open this publication in new window or tab >>Ultrabroadband super-Planckian radiative heat transfer with artificial continuum cavity states in patterned hyperbolic metamaterials
2017 (English)In: Physical Review B, ISSN 2469-9950, E-ISSN 2469-9969, Vol. 95, no 24, article id 245405Article in journal (Refereed) Published
Abstract [en]

Localized cavity resonances due to nanostructures at material surfaces can greatly enhance radiative heat transfer (RHT) between two closely placed bodies owing to stretching of cavity states in momentum space beyond the light line. Based on such understanding, we numerically demonstrate the possibility of ultrabroadband super-Planckian RHT between two plates patterned with trapezoidal-shaped hyperbolic metamaterial (HMM) arrays. The phenomenon is rooted not only in HMM's high effective index for creating subwavelength resonators but also its extremely anisotropic isofrequency contour. The two properties enable one to create photonic bands with a high spectral density to populate a desired thermal radiation window. At submicron gap sizes between such two plates, the artificial continuum states extend outside the light cone, tremendously increasing overall RHT. Our study reveals that structured HMM offers unprecedented potential in achieving a controllable super-Planckian radiative heat transfer for thermal management at nanoscale.

Place, publisher, year, edition, pages
American Physical Society, 2017
National Category
Physical Sciences
Identifiers
urn:nbn:se:kth:diva-210471 (URN)10.1103/PhysRevB.95.245405 (DOI)000402929900006 ()2-s2.0-85023188371 (Scopus ID)
Funder
Swedish Research Council, 2011-4526
Note

QC 20170705

Available from: 2017-07-05 Created: 2017-07-05 Last updated: 2018-09-19Bibliographically approved
Li, Y., Fu, Q., Yu, S., Yan, M. & Berglund, L. (2016). Optically Transparent Wood from a Nanoporous Cellulosic Template: Combining Functional and Structural Performance. Biomacromolecules, 17(4), 1358-1364
Open this publication in new window or tab >>Optically Transparent Wood from a Nanoporous Cellulosic Template: Combining Functional and Structural Performance
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2016 (English)In: Biomacromolecules, ISSN 1525-7797, E-ISSN 1526-4602, Vol. 17, no 4, p. 1358-1364Article in journal (Refereed) Published
Abstract [en]

Optically transparent wood (TW) with transmittance as high as 85% and haze of 71% was obtained using a delignified nanoporous wood template. The template was prepared by removing the light-absorbing lignin component, creating nanoporosity in the wood cell wall. Transparent wood was prepared by successful impregnation of lumen and the nanoscale cellulose fiber network in the cell wall with refractive-index-matched prepolymerized methyl methacrylate (MMA). During the process, the hierarchical wood structure was preserved. Optical properties of TW are tunable by changing the cellulose volume fraction. The synergy between wood and PMMA was observed for mechanical properties. Lightweight and strong transparent wood is a potential candidate for lightweight low-cost, light-transmitting buildings and transparent solar cell windows.

Place, publisher, year, edition, pages
American Chemical Society (ACS), 2016
Keywords
Solar-Cells, Nanofiber Paper, Scattering, Efficient, Fibers, Film
National Category
Polymer Chemistry
Identifiers
urn:nbn:se:kth:diva-187074 (URN)10.1021/acs.biomac.6b00145 (DOI)000374076900013 ()26942562 (PubMedID)2-s2.0-84964600674 (Scopus ID)
Funder
Knut and Alice Wallenberg Foundation
Note

QC 20160518

Available from: 2016-05-18 Created: 2016-05-17 Last updated: 2018-02-21Bibliographically approved
Gong, H., Chen, X., Qu, Y., Li, Q., Yan, M. & Qiu, M. (2016). Photothermal Switching Based on Silicon Mach-Zehnder Interferometer Integrated with Light Absorber. IEEE Photonics Journal, 8(2), Article ID 7456199.
Open this publication in new window or tab >>Photothermal Switching Based on Silicon Mach-Zehnder Interferometer Integrated with Light Absorber
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2016 (English)In: IEEE Photonics Journal, ISSN 1097-5764, E-ISSN 1943-0655, Vol. 8, no 2, article id 7456199Article in journal (Refereed) Published
Abstract [en]

We present an all-optical switch based on photothermal effects in a silicon Mach-Zehnder interferometer (MZI) integrated with a light absorber. The metal-insulator-metal light absorber located near the longer arm of the asymmetric MZI efficiently converts infrared light to heat. Pumped by a continuous-wave 1064-nm laser, the spectral transmittance of the fully etched strip waveguide (half-etched rib waveguide) MZI can be tuned with an efficiency of 38 pm/mW (98.5 pm/mW). Dynamic switching experiments show that the rise/fall time constant of the output probe light is 11.45/10.98 μs (8.25/7.13 μs) for the fully etched (half-etched) MZI.

Place, publisher, year, edition, pages
Institute of Electrical and Electronics Engineers (IEEE), 2016
Keywords
Fabrication and charaterization, Integrated nanophotonic systems, Photothermal effect, Silicon nanophotonics, Waveguides
National Category
Other Engineering and Technologies
Identifiers
urn:nbn:se:kth:diva-187184 (URN)10.1109/JPHOT.2016.2550319 (DOI)000388089100050 ()2-s2.0-84964692040 (Scopus ID)
Note

QC 20160520

Available from: 2016-05-20 Created: 2016-05-18 Last updated: 2017-11-30Bibliographically approved
Dai, J., Dyakov, S. A. & Yan, M. (2016). Radiative heat transfer between two dielectric-filled metal gratings. PHYSICAL REVIEW B, 93(15), Article ID 155403.
Open this publication in new window or tab >>Radiative heat transfer between two dielectric-filled metal gratings
2016 (English)In: PHYSICAL REVIEW B, ISSN 2469-9950, Vol. 93, no 15, article id 155403Article in journal (Refereed) Published
Abstract [en]

Nanoscale surface corrugation is known to be able to drastically enhance radiative heat transfer between two metal plates. Here we numerically calculate the radiative heat transfer between two dielectric-filled metal gratings at dissimilar temperatures based on a scattering approach. It is demonstrated that, compared to unfilled metal gratings, the heat flux for a fixed geometry can be further enhanced, by up to 650% for the geometry separated by a vacuum gap of g = 1 mu m and temperature values concerned in our study. The enhancement in radiative heat transfer is found to depend on refractive index of the filling dielectric, the specific grating temperatures, and naturally the gap size between the two gratings. The enhancement can be understood through examining the transmission factor spectra, especially the spectral locations of the spoof surface plasmon polariton modes. Of more practical importance, it's shown that the radiative heat flux can exceed that between two planar SiC plates with same thickness, separation, and temperature settings over a wide temperature range. This reaffirms that one can harness rich electromagnetic modal properties in nanostructured materials for efficient thermal management at nanoscale.

National Category
Physical Sciences
Identifiers
urn:nbn:se:kth:diva-185983 (URN)10.1103/PhysRevB.93.155403 (DOI)000373569000003 ()2-s2.0-84963747850 (Scopus ID)
Note

QC 20160509

Available from: 2016-05-09 Created: 2016-04-29 Last updated: 2016-11-07Bibliographically approved
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ORCID iD: ORCID iD iconorcid.org/0000-0002-3368-9786

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