Interface reactions and electrical properties of metal contacts (Ti, In, Au, W) on p-ZnSe

Goesmann, Fred; Mölle, Matthias; Studnitzky, Thomas; Schmid–Fetzer, Rainer

doi:10.1088/0268-1242/13/2/014

Cited by 4 publications

(2 citation statements)

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“…However various metals have been deposited on ZnSe in attempts to make reliable electrical contacts. 21,22 Useful information on adhesion can be gleaned from these works. Metals have also been used for electrical contacts of GaAs waveguide lasers, where the metal is part of the waveguide and affects the optical loss.…”

Section: Selection Of Reflective Coatingmentioning

confidence: 99%

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Fabrication and current optical performance of a large diamond-machined ZnSe immersion grating

et al. 2010

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ZnSe immersion gratings provide the possibility of high resolution spectroscopy in the wide infrared wavelength region from the NIR (Near Infrared) to the MIR (Mid Infrared), because ZnSe has a high refractive index (n ∼ 2.45) and a low internal extinction in these wavelength regions. We are developing ZnSe immersion grating for a ground-based NIR high-resolution spectrograph and a space MIR high-resolution spectrograph. We already have produced fine grooves on the ZnSe flat substrate with a small pitch (∼ 30 µm) using nano precision flycutting technique at the Lawrence Livermore National Laboratory, 1 which satisfies our requirements even for the short NIR application.2 Our next step is to fabricate a large prism-shaped ZnSe immersion grating with this technology. The triangle prism has the entrance surface 50mm × 23mm and the apex angle of 70 deg. Untile now, we tried three R&D cutting runs. We examined the optical performances of the immersion grating sample from the second cutting run, which showed the best performances. Although a lot of chipping are seen at the edge of the blaze by the microscopic observation, we found that the groove shape is quite good with the surface irregularity of 0.74λ (pv) and the random pitch error of 5.2 nm (rms), which closely meet with our requirements. In the HeNe laser spectra taken under both grism and immersion configurations, strong ghosts were observed at the intermedium of the diffracted orders. These interorder ghosts may originate from the differences of the pitch and/or shape between odd and even grooves due to the cutting procedures. In addition, we also investigated a suitable reflectivecoating for the diffraction surface. As a result, we concluded that aluminum or cupper by suppering process is the best materials in the wavelength region of WINERED. Finally, we discuss the pssible improvement points and prospect for the next trial in this summer.

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Section: Selection Of Reflective Coatingmentioning

confidence: 99%

“…22 To make gold adhere one needs an intermediate thin-layer of a reactive metal like Cr, as used for Si immersion grating (3 to 5 µm) 25 and Ge immersion grating (8 to 13µm) ZnSe to form silver or copper selenide. This implies good adhesion and indeed this has been observed.…”

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confidence: 99%