Infrared reflectance and transmission spectra in II-VI alloys and superlattices
Room temperature measurements of the far-infrared (FIR) reflectance spectra are reported for the polar optical phonons in a series of bulk Cd[subscript x]Zn[subscript 1−x]Te (0 ≤ x ≤ 1) and CdSe[subscript x]Te[subscript 1−x] (0 < x ≤ 0.35) crystals grown by Bridgman technique. The composition-dep...
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| Format: | Article |
| Language: | en_US |
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American Physical Society (APS)
2012
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| Online Access: | http://hdl.handle.net/1721.1/69603 https://orcid.org/0000-0002-0769-0652 |
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| author | Talwar, Devki N. Yang, Tzuen-Rong Feng, Zhe Chuan Becla, Piotr |
| author2 | MIT Materials Research Laboratory |
| author_facet | MIT Materials Research Laboratory Talwar, Devki N. Yang, Tzuen-Rong Feng, Zhe Chuan Becla, Piotr |
| author_sort | Talwar, Devki N. |
| collection | MIT |
| description | Room temperature measurements of the far-infrared (FIR) reflectance spectra are reported for the polar optical phonons in a series of bulk Cd[subscript x]Zn[subscript 1−x]Te (0 ≤ x ≤ 1) and CdSe[subscript x]Te[subscript 1−x] (0 < x ≤ 0.35) crystals grown by Bridgman technique. The composition-dependent spectra exhibited many fundamental aspects of lattice vibrations, while the results of long-wavelength optical modes for the end member binary compounds displayed phonon values in good agreement with the existing inelastic neutron scattering and/or Raman spectroscopy data. Using a standard methodology of multilayer optics with effective-medium dielectric tensors, we simulated the FIR transmission and reflectivity spectra at oblique incidence (Berreman's effect) in many II-VI free-standing thin films, epilayers and superlattices. Berreman's approach provided us with a strong basis for analyzing the infrared experimental data and offered an effective means of estimating the zone-center transverse and longitudinal optical (ω[subscript TO], ω[subscript LO]) phonon frequencies in polar-semiconductor thin films and heterostructure materials of increasing technological importance. |
| first_indexed | 2024-09-23T14:14:35Z |
| format | Article |
| id | mit-1721.1/69603 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T14:14:35Z |
| publishDate | 2012 |
| publisher | American Physical Society (APS) |
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| spelling | mit-1721.1/696032022-09-28T19:27:18Z Infrared reflectance and transmission spectra in II-VI alloys and superlattices Talwar, Devki N. Yang, Tzuen-Rong Feng, Zhe Chuan Becla, Piotr MIT Materials Research Laboratory Massachusetts Institute of Technology. Department of Materials Science and Engineering Becla, Piotr Becla, Piotr Room temperature measurements of the far-infrared (FIR) reflectance spectra are reported for the polar optical phonons in a series of bulk Cd[subscript x]Zn[subscript 1−x]Te (0 ≤ x ≤ 1) and CdSe[subscript x]Te[subscript 1−x] (0 < x ≤ 0.35) crystals grown by Bridgman technique. The composition-dependent spectra exhibited many fundamental aspects of lattice vibrations, while the results of long-wavelength optical modes for the end member binary compounds displayed phonon values in good agreement with the existing inelastic neutron scattering and/or Raman spectroscopy data. Using a standard methodology of multilayer optics with effective-medium dielectric tensors, we simulated the FIR transmission and reflectivity spectra at oblique incidence (Berreman's effect) in many II-VI free-standing thin films, epilayers and superlattices. Berreman's approach provided us with a strong basis for analyzing the infrared experimental data and offered an effective means of estimating the zone-center transverse and longitudinal optical (ω[subscript TO], ω[subscript LO]) phonon frequencies in polar-semiconductor thin films and heterostructure materials of increasing technological importance. Indiana University of Pennsylvania. Graduate School (Innovation Grant) National Science Council (China) (Grant No. NSC 98-2221-E-002-015-MY3) National Science Council (China) (Grant No. NSC 98-3114-E-005-002-CC2) 2012-03-08T19:11:56Z 2012-03-08T19:11:56Z 2011-11 2011-08 Article http://purl.org/eprint/type/JournalArticle 1098-0121 1550-235X http://hdl.handle.net/1721.1/69603 Talwar, Devki et al. “Infrared Reflectance and Transmission Spectra in II-VI Alloys and Superlattices.” Physical Review B 84.17 (2011): n. pag. Web. 8 Mar. 2012. © 2011 American Physical Society https://orcid.org/0000-0002-0769-0652 en_US http://dx.doi.org/10.1103/PhysRevB.84.174203 Physical Review B Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. application/pdf American Physical Society (APS) APS |
| spellingShingle | Talwar, Devki N. Yang, Tzuen-Rong Feng, Zhe Chuan Becla, Piotr Infrared reflectance and transmission spectra in II-VI alloys and superlattices |
| title | Infrared reflectance and transmission spectra in II-VI alloys and superlattices |
| title_full | Infrared reflectance and transmission spectra in II-VI alloys and superlattices |
| title_fullStr | Infrared reflectance and transmission spectra in II-VI alloys and superlattices |
| title_full_unstemmed | Infrared reflectance and transmission spectra in II-VI alloys and superlattices |
| title_short | Infrared reflectance and transmission spectra in II-VI alloys and superlattices |
| title_sort | infrared reflectance and transmission spectra in ii vi alloys and superlattices |
| url | http://hdl.handle.net/1721.1/69603 https://orcid.org/0000-0002-0769-0652 |
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