TY - JOUR
T1 - The study of waveguides made by diffusion of Br into AgCl substrates and the transmission of mid-IR radiation through these waveguides
AU - Dekel, B.
AU - Barkay, Z.
AU - Katzir, A.
N1 - Funding Information:
The authors would like to thank to Prof. Frank Moser for his helpful feedback and to Mr. Arie Levite and members of the Machine Shop of The School of Physics and Astronomy of Tel Aviv University for their fruitful help. This research was supported in part by the European Union IMSIS project (no. EVK1-CT-1999-00042).
PY - 2001/12/1
Y1 - 2001/12/1
N2 - Silver halide crystals of the form AgClxBr1-x can be grown from the melt in all ratios of Cl:Br and they are highly transparent in the middle infrared. The index of refraction of such mixed crystals increases monotonically with x, from that of AgCl (x = 1, n = 1.98) to that of AgBr (x = 0, n = 2.16). These properties suggested that they could be used to form graded index waveguides for the mid-IR. Cylindrical ingots of crystals of composition AgCl0.9Br0.1 and AgCl0.1Br0.9 were grown; discs from each were cut and polished and placed in optical contact at 410°C. Diffusion of Br ions from the Br-rich side to the Cl-rich side produced a graded index waveguides whose thickness was determined by the diffusion time. The diffusion depth was obtained by scanning electron microscopy and by optical methods. These studies provide information about the diffusion coefficients of ions in silver halide crystals and the optical properties of the diffused layers. These silver halide waveguides will be useful as integrated optical elements in the mid-IR.
AB - Silver halide crystals of the form AgClxBr1-x can be grown from the melt in all ratios of Cl:Br and they are highly transparent in the middle infrared. The index of refraction of such mixed crystals increases monotonically with x, from that of AgCl (x = 1, n = 1.98) to that of AgBr (x = 0, n = 2.16). These properties suggested that they could be used to form graded index waveguides for the mid-IR. Cylindrical ingots of crystals of composition AgCl0.9Br0.1 and AgCl0.1Br0.9 were grown; discs from each were cut and polished and placed in optical contact at 410°C. Diffusion of Br ions from the Br-rich side to the Cl-rich side produced a graded index waveguides whose thickness was determined by the diffusion time. The diffusion depth was obtained by scanning electron microscopy and by optical methods. These studies provide information about the diffusion coefficients of ions in silver halide crystals and the optical properties of the diffused layers. These silver halide waveguides will be useful as integrated optical elements in the mid-IR.
KW - Graded index optical waveguide
KW - Integrated optics
KW - Ion diffusion in solids
KW - Middle infrared
KW - Silver halide crystal
UR - http://www.scopus.com/inward/record.url?scp=0035575950&partnerID=8YFLogxK
U2 - 10.1016/S0030-4018(01)01566-8
DO - 10.1016/S0030-4018(01)01566-8
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AN - SCOPUS:0035575950
VL - 199
SP - 383
EP - 388
JO - Optics Communications
JF - Optics Communications
SN - 0030-4018
IS - 5-6
ER -