Unambiguous photoreflectance determination of electric fields using phase suppression

S. L. Tyan, Y. C. Wang, J. S. Hwang, H. Shen

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)


Photoreflectance measurements have been performed on a δ-doped GaAs homojunction. Two Franz-Keldysh oscillation features originating from two different regions (a buffer layer and a top layer) of the structure superimpose with each other in the photoreflectance spectrum. By properly selecting the reference phase, one of the features can be suppressed, thus enabling us to determine the electric fields from the two regions unambiguously. The electric field in the top layer is 3.5±0.2×105 V/cm, which is in good agreement with theoretical calculation. The electric field in the buffer layer is 1.2±0.1×104 V/cm.

Original languageEnglish
Pages (from-to)3452-3454
Number of pages3
JournalApplied Physics Letters
Issue number24
Publication statusPublished - 1996

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)


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