The Preparation and Optical Properties of Gold Blacks*†

Harris, Louis; McGinnies, Rosemary T.; Siegel, Benjamin M.

doi:10.1364/josa.38.000582

Cited by 123 publications

(40 citation statements)

References 5 publications

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“…In films prepared using this procedure, a complex granular structure results from the randomization of atomic velocities before aggregation in the gas phase [8][9][10][11][12] . Such films often but not always resemble the product of diffusion-limited aggregation.…”

Section: Sample Fabrication and Morphologymentioning

confidence: 99%

Photoacoustic ultrasound sources from diffusion-limited aggregates

Patel

Brubaker

Kotlerman

et al. 2016

Applied Physics Letters

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Metallic diffusion-limited aggregate (DLA) films are well-known to exhibit near-perfect broadband optical absorption. We demonstrate that such films also manifest a substantial and relatively material-independent photoacoustic response, as a consequence of their random nanostructure. We theoretically and experimentally analyze photoacoustic phenomena in DLA films, and show that they can be used to create broadband aircoupled acoustic sources. These sources are inexpensive and simple to fabricate, and work into the ultrasonic regime. We illustrate the device possibilities by building and testing an optically-addressed acoustic phased array capable of producing virtually arbitrary acoustic intensity patterns in air.

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Section: Sample Fabrication and Morphologymentioning

confidence: 99%

Photoacoustic ultrasound sources from diffusion-limited aggregates

Patel

Brubaker

Kotlerman

et al. 2016

Applied Physics Letters

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“…Harris 9 indicates that an "80% layer," i.e., one that absorbs 80% of the incident energy (aei = 0.8) has the greatest efficiency. This absorbed energy is dissipated as follows: (1) heating the absorbing layer (QD), (2) heating the membrane (Q2), (3) heating the oil film (Q3), (4) evaporating a portion of the oil film (Q4), (5) reradiation losses (Q5), (6) conduction losses (Q6), and (7) convection losses (Q).…”

Section: Theoretical Sensitivitymentioning

confidence: 99%

Thermal Imaging by Means of the Evaporograph

McDaniel¹,

Robinson²

1962

Appl. Opt.

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The development of a thermal imaging device which operates on the principle of differential evaporation (or condensation) of oil on a thin membrane is described. Section I,A summarizes the requirements of any thermal imaging method and develops the theory as applied to the particular case of the Evaporograph, emphasizing the consideration of scene temperatures near 20'C. It is shown that the greatest component of irradiance at the membrane is utilized in the evaporation of the oil layer. A presentation system which forms a visible image based on the phenomenon of light interference to detect differences in the thickness of the oil film is described. Theoretical calculations based on this system, assuming a reasonable minimum detectable thickness difference, indicate that a temperature difference of 1 0 C in the scene can be detected with an f = 2 optical system. Experimental results confirm this. The application of the Evaporograph to quantitative measurements is indicated. Section I,B describes experimental work on the three components of the Evaporograph, the infrared optical system, the transducer or cell, and the visual optical system. The two commercial models which have evolved from this work are described. These Evaporographs can detect a temperature difference of 1 0 C from a 20'C background and have a resolution of 10 lines per mm. Various applications are pictured and described.

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“…Pfund deposited metal-blacks on nitrocellulose films in an environment of nitrogen or air. Harris studied gold-black films from the late 1940's into the 1960's [5][6][7][8][9]. The films were prepared similarly to Pfund's (deposited on thin membranes of cellulose nitrate in a partial atmosphere of nitrogen), with emphasis on the pressure of nitrogen and the evaporation rate as prime factors determining the morphology of the films.…”

Section: Introductionmentioning

confidence: 99%

“…The films were prepared similarly to Pfund's (deposited on thin membranes of cellulose nitrate in a partial atmosphere of nitrogen), with emphasis on the pressure of nitrogen and the evaporation rate as prime factors determining the morphology of the films. Optical properties were studied by Harris from the wavelength range of 3 to 15 microns [5], and later from 15 to 110 microns [8]. Deposition by evaporation in an inert gas at tenths to tens of Torr has followed the method of Harris with little change.…”

Section: Introductionmentioning

confidence: 99%

Effects of Polymer Infusion and Characteristic Length Scale on Gold-Black Long-Wave and Far-Infrared Absorbance

Cleary¹,

Peale²,

Ishigami³

et al. 2011

JMSE-A

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Infrared absorbance is investigated in gold-black, a porous nano-structured conducting film. A two level full factorial optimization study with evaporation-chamber pressure, boat current, substrate temperature, and degree of polymer infusion (for hardening) was performed. Polymer infusion was found generally to reduce absorbance in the long wave IR but has little effect at THz wavelengths, although for samples with the highest absorbance there is a slight improvement in the absorbance figure of merit (FOM) in both wavelength regimes. The characteristic length scales of the structured films vary considerably as a function of deposition parameters, but the IR FOM is found to be weakly correlated with these distributions, which are determined by wavelet analysis of scanning electron micrographs.

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The Preparation and Optical Properties of Gold Blacks*†

Cited by 123 publications

References 5 publications

Photoacoustic ultrasound sources from diffusion-limited aggregates

Photoacoustic ultrasound sources from diffusion-limited aggregates

Thermal Imaging by Means of the Evaporograph

Effects of Polymer Infusion and Characteristic Length Scale on Gold-Black Long-Wave and Far-Infrared Absorbance

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