Yuchen Song

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Questions related from Yuchen Song

How to improve surface roughness of 1:1 selectivity Silicon dry etching with RIE?

Dear reader: Thank you very much for looking into this question! I am testing a dry etching process that transfers the photoresist profile into silicon. The target is using O2/SF6 reactive ion...

06 November 2023 556 4 View

How to do impedance matching while the transmission line length is shorter than 1/4λ?

Firstly, thank you very much for reading this question! Now I am designing a T junction build-up with the transmission line. I find that I have to design this T junction within a dimension less...

25 May 2022 8,228 2 View

Where is the active point of VCSEL?

I am now working on the coupling between vertical-cavity surface-emission laser(VCSEL) and waveguide. However, the window design for laser emission is larger than the waist of Gaussian beam...

28 January 2021 8,514 1 View

Where does the energy go for electromagnectic wave below cutoff frequency in a metal waveguide?

For a rectangular waveguide, there is a cutoff frequency, which is the lowest frequency allowing an electromagnetic wave to travel. For analytical solutions, the propagation constant for an...

01 May 2020 588 24 View