Patent ID: 7687295
Filing Date: 2010-03-30
Classification: H01L,H01S

Abstract:
1. A method for manufacturing an optical semiconductor device that transmits or receives optical signals substantially perpendicularly to or in parallel to an active surface formed on a semiconductor substrate, said method comprising the steps of: forming a photoresist pattern having a reverse taper or a reverse step formed at the ends, on the entire surface of the semiconductor substrate except for a position where an electrode pattern is to be deposited; depositing an electrode layer having a taper or a step formed at the ends by electron beam and the photoresist pattern; and stripping the photoresist pattern; wherein said reverse taper or said reverse step is processed by patterning a two-stage photoresist in which a second positive photoresist that is lower in sensitivity is formed on a first positive photoresist that is higher in sensitivity by one exposure.