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- Title
EFFECT OF SWIFT HEAVY ION IRRADIATION ON OPTICAL AND STRUCTURAL PROPERTIES OF AMORPHOUS Ge-As-Se THIN FILMS.
- Authors
CHAUHAN, RASHMI; TRIPATHI, ARVIND; SRIVASTAVA, AMIT KUMAR; SRIVASTAVA, KRISHNA KANT
- Abstract
The present study reports about changes in optical parameters of amorphous Ge7.533As38.698Se53.769 thin films upon 100 MeV Ag swift-heavy ions (SHI) for five different fluences (3x1010, 1x1011, 3x1011, 1x1012, and 3x1012 ions/cm²). Linear optical absorption coefficient (α), optical bandgap (Eg), and linear refractive index (n0) of films are calculated from optical transmission spectra, and nonlinear refractive index (n2) is determined using semi-empirical relations. It is observed that SHI irradiation up to fluence 3x1012 ions/cm² causes reduction in optical bandgap (1.74 eV to 1.58 eV), whereas increase in linear refractive index (2.86 to 2.95) and nonlinear refractive index (1.37x10-10 [esu] to 2.02x10-10 [esu]). These optical changes are explained in terms of structural changes using Raman spectroscopy, which predicts that swift-heavy ion irradiation causes local structural disorder, whereas optical elasticity is maintained up to threshold limit (3x1012 ions/cm²). The utilization of the study is discussed in terms of upcoming optical technologies.
- Subjects
GALLIUM compounds; METALLIC films; HEAVY ions; IRRADIATION; CRYSTAL structure; REFRACTIVE index
- Publication
Chalcogenide Letters, 2013, Vol 10, Issue 2, p63
- ISSN
1841-4834
- Publication type
Article