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Application of electron beam lithography to produce corrugated surface for DFB lasers
P.R. Deshmukh, M. Singh, , W.S. Khokle, B.B. Pal
Published in SPIE
Volume: 1622
Pages: 63 - 67
For long wavelength single node DFB type laser devices it is required to corrugate the surface of InP substrate in the form of lines (Grating) with spatial period in sub-half micron range. Electron beam lithography (EBL) can be used to make such high resolution lines first in the resist and then these lines can be transferred to the substrate by suitable dry or wet etching process. In delineating such closely spaced lines in the resist which is coated on a relatively high average atomic number substrate (At.No.32), the well known proximity exposure (PE) effect associated with EBL requires correction. The paper discusses and gives the simulation results which depict the effect of PE on the width and spacing of lines. A comparison is made between the lines on the lower At.No. substrate Si, and high At.No. InP substrate. A proximity exposure compensation (PEC) scheme based on dose variation technique is found to provide just adequate correction to PE effect. The experimental results on the delineation of lines before and after correction show good agreement with the simulated results within experimental limitations. © 1991 SPIE. All rights reserved.
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JournalData powered by TypesetProceedings of SPIE - The International Society for Optical Engineering
PublisherData powered by TypesetSPIE