Hidden black : coherent enhancement of absorption in strongly scattering media
We show that a weakly absorbing, strongly scattering (white) medium can be made very strongly absorbing at any frequency within its strong-scattering bandwidth by optimizing the input electromagnetic field. For uniform absorption, results from random matrix theory imply that the reflectivity of the...
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| Main Authors: | , |
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| Other Authors: | |
| Format: | Article |
| Language: | English |
| Published: |
2013
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| Subjects: | |
| Online Access: | https://hdl.handle.net/10356/101163 http://hdl.handle.net/10220/18336 |
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| Institution: | Nanyang Technological University |
| Language: | English |
| Summary: | We show that a weakly absorbing, strongly scattering (white) medium can be made very strongly absorbing at any frequency within its strong-scattering bandwidth by optimizing the input electromagnetic field. For uniform absorption, results from random matrix theory imply that the reflectivity of the medium can be suppressed by a factor ∼(ℓ a /ℓ)N −2 , where N is the number of incident channels and ℓ , ℓ a are the elastic and absorption mean free paths, respectively. It is thus possible to increase absorption from a few percent to >99% . For a localized weak absorber buried in a nonabsorbing scattering medium, we find a large but bounded enhancement. |
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