Browsing by Author "Huang, Hung Ji"

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Light energy transformation over a few nanometers
(2017-09-20)
Huang, Hung Ji
;
Liu, Bo-Heng
;
Su, James
;
Chen, Po-Jui
;
Lin, Chun-Ting
Continuous platinum (Pt) thin film was fabricated via the plasma-enhanced atomic layer deposition method for a study of light energy transformation over a few nanometers. Light-to-heat experiments were used to determine the oscillating size effects on electromagnetic energy transformation in quantum wells of smooth and condensed Pt thin films. For Pt-film thicknesses of around 4 nm, 7 nm and 12 nm, electromagnetic heating presented unexpectedly high energy conversion efficiency. An empirical equation acquired from the fitting of the experimental data from various thicknesses of Pt thin films was suggested to describe the oscillating electromagnetic heating and quantized energy transformation. The experimental results show that size control of the nanostructures is extremely important for future applications involving quantum effects in nano devices.
Near-Field Optical Imaging of a Porous Au Film: Influences of Topographic Artifacts and Surface Plasmons
(2013-06-01)
Lin, Yu-Hsuan
;
Haendel, Benjamin
;
Huang, Hung Ji
;
Chen, Hsiang-An
;
Chen, Yung-Fu
In this work, near-field scanning optical microscopy is employed to study a porous Au film and the direct observation of topographic artifacts and surface plasmon influences is revealed. Under tip illumination, topographic artifacts are found to be present in a reflection mode optical image but not in a transmission mode image. A simple algorithm is used for filtering the topographic artifacts and extracting a correct near-field optical image approximately. On the other hand, surface plasmon influences are present in both modes. By using three exciting wavelengths of 488, 647.1, and 520.8 nm, it is confirmed that a suitable wavelength should be chosen for avoiding the surface plasmon interference in a near-field optical investigation of morphological or material dielectric contrast. Finally, plasmonic or nonplasmonic regions on the porous Au film can be identified from the observed optical intensity variation in the optical images obtained at incident polarizations of 0 degrees, 90 degrees, and 45 degrees.
Optical imaging with spectrum aberration correction using a filtering macrolens
(2013-07-20)
Lin, Yu-Hsuan
;
Lai, Jyun-Yi
;
Tsai, Hsin-Yi
;
Chang, Han-Chao
;
Huang, Hung Ji
A filtering macrolens was developed to simultaneously achieve macro-optical imaging and correct spectrum aberration. The macrolens was a doublet lens comprising a filtering lens and a close-up lens. The shape of the filtering lens was designed to eliminate the optical path differences between the light rays in the absorbing medium. The close-up lens was designed to decrease the effective focal length of an ordinary camera lens to provide high magnification capability and collimate the diverging beams through the filtering lens. Experimental results demonstrated that the spectrum uniformity of the macro-optical images was markedly improved by the filtering macrolens. This innovation may be used in finite conjugate optical systems. (C) 2013 Optical Society of America