In:
Japanese Journal of Applied Physics, IOP Publishing, Vol. 40, No. 8R ( 2001-08-01), p. 4886-
Abstract:
A La 0.67 Ca 0.33 MnO 3- y (LCMO) thin film has been grown by laser ablation and was fabricated into a microbridge by conventional photolithography and dry etching for optical detection. The measured photoresponse, Δ V , of this LCMO thin-film microbridge reveals that it is bolometric in nature. The photoresponse is linearly proportional to the bias current I b and the power density of irradiation W D , which strongly suggests the applicability of an LCMO thin-film microbridge to a linear optical detector. The ratio of the photoresponse to the irradiated power density, Δ V / W D , is independent of the incident-light wavelength λ from 0.633 to 3.5 µm. The dependence of the photoresponse on modulated frequency f , follows the Δ V ∝ f -0.21 relation. Under I b =100 µA and f =5 Hz at an operating temperature T op =223 K, the responsivity S and noise voltage V n are 685 V/W and 20 nV·Hz -0.5 , respectively, for this LCMO thin-film microbridge. From the measured S and V n , the noise equivalent power (NEP) and detectivity D * were be calculated to be 2.92×10 -11 W·Hz -0.5 and 2.76×10 9 cm·Hz 0.5 ·W -1 , respectively, for this LCMO thin-film microbridge. The experimental results from this LCMO thin-film microbridge show the practical applicability of this new detector system compared to other established detectors.
Type of Medium:
Online Resource
ISSN:
0021-4922
,
1347-4065
DOI:
10.1143/JJAP.40.4886
Language:
Unknown
Publisher:
IOP Publishing
Publication Date:
2001
detail.hit.zdb_id:
218223-3
detail.hit.zdb_id:
797294-5
detail.hit.zdb_id:
2006801-3
detail.hit.zdb_id:
797295-7
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