Stress effects in prism coupling measurements of thin polymer films

agan, S.; Ay, F.; Kocabas, Askin; Aydınlı, Atilla

doi:10.1007/s00339-003-2222-5

Cited by 20 publications

(21 citation statements)

References 21 publications

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“…For PS films, the corresponding value is reported to be about ͑2-3͒ ϫ 10 9 N/m 2 . 23,24 Most of the films studied in the literature were bulk PS specimens with typical dimensions of the order of millimeters. The moduli were measured under tensile stress in stretching condition corresponding to an in-plane modulus.…”

Section: Resultsmentioning

confidence: 99%

“…27,28 The difference ͑C 1 − C 2 ͒ = C is the usually reported and widely used value for the stress-optic coefficient of a material when a measurement of the birefringence is made under uniaxial stress conditions. 23,29 The bulk counterpart of the polymer films investigated in this study are known to be isotropic. In the thin film form, on the other hand, these polymers were found to be slightly anisotropic.…”

Section: Resultsmentioning

confidence: 99%

“…The difference of ͑C 1 − C 2 ͒ can be used to compare our results with the widely reported stress-optic coefficient C for bulk polymers where measurement of birefringence is made under uniaxial stress conditions. 23,29 For bulk PS, C is positive with a value of 8.3Br, whereas the calculated C for PS thin films is negative with a value of −19Br. The bulk material value is in agreement with the value of 8-10 Br in other reports in the literature.…”

Section: ͑6͒mentioning

confidence: 91%

“…The bulk material value is in agreement with the value of 8-10 Br in other reports in the literature. 23,24,27 The process of determination of the stress-optic constant C is the key factor in the apparent sign mismatch of the mentioned parameter. Namely, the reported stress-optical coefficients C for bulk PS materials are calculated from the birefringence and stress measurements when the material is under tensile stress.…”

Section: ͑6͒mentioning

confidence: 99%

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Prism coupling technique investigation of elasto-optical properties of thin polymer films

Kocabas

Kocabaş

et al. 2004

Journal of Applied Physics

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The use of thin polymer films in optical planar integrated optical circuits is rapidly increasing. Much interest, therefore, has been devoted to characterizing the optical and mechanical properties of thin polymer films. This study focuses on measuring the elasto-optical properties of three different polymers; polystyrene, polymethyl-methacrylate, and benzocyclobutane. The out-of-plane elastic modulus, refractive index, film thickness, and birefringence of thin polymer films were determined by means of the prism coupling technique. The effect of the applied stress on the refractive index and birefringence of the films was investigated. Three-dimensional finite element method analysis was used so as to obtain the principal stresses for each polymer system, and combining them with the stress dependent refractive index measurements, the elasto-optic coefficients of the polymer films were determined. It was found that the applied stress in the out-of-plane direction of the thin films investigated leads to negative elasto-optic coefficients, as observed for all the three thin polymer films.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: ͑6͒mentioning

confidence: 91%

Section: ͑6͒mentioning

confidence: 99%

See 2 more Smart Citations

Prism coupling technique investigation of elasto-optical properties of thin polymer films

Kocabas

Kocabaş

et al. 2004

Journal of Applied Physics

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“…This technique is suitable and frequently applied in order to measure the variations of optical parameters from a transparent waveguide. [19][20][21] The experimental setup is presented in Fig. 2.…”

Section: B Determination Of Deposited Films Thickness and Refractivementioning

confidence: 99%

Nanostructured ZnO coatings grown by pulsed laser deposition for optical gas sensing of butane

Mazingue

Escoubas

Spalluto

et al. 2005

Journal of Applied Physics

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We report the detection of 100 ppm of butane in superatmospheric N 2 or air with an m-lines setup. The sensing elements are ZnO-nanostructured coatings prepared by pulsed laser deposition. The deposition technique was optimized to obtain highly transparent films of 1 cm 2 in area and several hundreds nanometer thick. ZnO structures preserve gas sensitivity even when deposited at room temperature. Refractive index variations down to 0.005 were detected and typical variations of about 20% were induced during ZnO film-butane contact.

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Nanostructured Thin Optical Sensors for Trace Gas Detection

Ristoscu

Caiteanu

Mihailescu

et al.

NATO Science for Peace and Security Series B: Physics and Biophysics

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-We report on new features of nanostructured coatings used in trace gas detection applications based on the modification of optical parameters. We review the general physical principles underlying the operation of optical detectors and introduce the basic systems used in trace gas recognition. Pd-doped SnO 2 thin films were pulsed laser deposited on Si (100) and quartz substrates in 10 Pa O 2 at different substrate temperatures. Coatings on Si were investigated by scanning electron microscopy and atomic force microscopy to determine their surface morphology and by grazing incidence X-ray diffraction for films structure. Twin films deposited on quartz were investigated using the m-line technique to monitor the variation of optical properties when exposed to butane diluted in N 2 down to 100 ppm concentration. The acquired expertise was used to design a miniaturized system which was tried in real conditions.

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Stress effects in prism coupling measurements of thin polymer films

Cited by 20 publications

References 21 publications

Prism coupling technique investigation of elasto-optical properties of thin polymer films

Prism coupling technique investigation of elasto-optical properties of thin polymer films

Nanostructured ZnO coatings grown by pulsed laser deposition for optical gas sensing of butane

Nanostructured Thin Optical Sensors for Trace Gas Detection

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