Thickness dependence of the anisotropy in thermal expansion of PMDA-ODA and BPDA-PDA thin films

Liou, Huey-Chiang; Ho, Paul S.; Stierman, R.J.

doi:10.1016/s0040-6090(98)01065-7

Cited by 46 publications

(45 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…This optical anisotropy increases with the increasing of speed deposition and with the increasing of curing temperature. Similar effects have been reported on thin polymeric films grown by spin coating technique [4,5]. In this case the anisotropy was mainly attributed to effects related to the orientation of the long polymeric chains during spinning process and solvent evaporation.…”

Section: Introductionsupporting

confidence: 82%

Evidence of refractive index anisotropy in hybrid sol-gel slab waveguides deposited by spin-coating technique

Prosposito¹,

Casalboni²,

Palazzesi³

et al. 2006

SPIE Proceedings

View full text Add to dashboard Cite

In this work we report on hybrid organic/inorganic sol-gel based optical waveguides in slab configuration grown both on glass and silicon substrates by spin-coating process. The samples were obtained using Zr(IV)-propoxide as inorganic precursor and 3-glycidoxypropyltrimethoxisilane (GLYMO) as organic component in molar ratio of 3/1. Optical characterization of each layer has been accomplished performing refractive index measurements at different wavelengths in the visible and near infrared regions using an home-made experimental setup developed in our laboratory. Measurements have evidenced a difference between the in-plane and out-of-plane refractive index. We found that the amount of the optical anisotropy depends on the speed of spinning deposition and on the curing temperature. In particular the anisotropy increases with the increasing of speed deposition and with the increasing of curing temperature. Results were also confirmed by spectroscopic ellipsometric measurements. We attributed the optical anisotropy to a preferential orientation of the organic groups of the alkoxysilane precursor (GLYMO) during spin coating deposition.

show abstract

Section: Introductionsupporting

confidence: 82%

Evidence of refractive index anisotropy in hybrid sol-gel slab waveguides deposited by spin-coating technique

Prosposito¹,

Casalboni²,

Palazzesi³

et al. 2006

SPIE Proceedings

View full text Add to dashboard Cite

show abstract

“…The observed anisotropy is mainly due to effects such as in-plane orientation of the polymeric chains during the spinning process and solvent evaporation and may depend on the specific type of polymer itself. 12,30 Due to the spinning process, the expected anisotropy of the layers is of uniaxial type and one of the principal axis of symmetry is parallel to the incident polarization. The measured birefringence in this case is Ͻ 0.002 and in this regime the isotropic assumption for mode equations remains as a reasonable approximation.…”

Section: Resultsmentioning

confidence: 99%

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

Kocabas

Kocabaş

et al. 2004

Journal of Applied Physics

View full text Add to dashboard Cite

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.

show abstract

“…loss; r: dielectric constant; E': Young's modulus; TS: tensile strength; CTE: coefficient of thermal expansion between 50 °C and 300 °C. Film stress is given for film below 20 m of thickness [5][6][7][8][9][10][11][12][13][14]. Table 2.…”

Section: Eg (Ev)mentioning

confidence: 99%

BPDA-PDA Polyimide: Synthesis, Characterizations, Aging and Semiconductor Device Passivation

Diaham¹,

Locatelli²,

Khazaka³

2012

High Performance Polymers - Polyimides Based - From Chemistry to Applications

View full text Add to dashboard Cite

Thickness dependence of the anisotropy in thermal expansion of PMDA-ODA and BPDA-PDA thin films

Cited by 46 publications

References 12 publications

Evidence of refractive index anisotropy in hybrid sol-gel slab waveguides deposited by spin-coating technique

Evidence of refractive index anisotropy in hybrid sol-gel slab waveguides deposited by spin-coating technique

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

BPDA-PDA Polyimide: Synthesis, Characterizations, Aging and Semiconductor Device Passivation

Contact Info

Product

Resources

About