Nano-scale three dimensional surface relief features using single exposure counterpropagating multiple evanescent waves interference phenomenon

Murukeshan, Vadakke Matham; Chua, Jeun Kee; Tan, Sia Kim; Lin, Qun Yin

doi:10.1364/oe.16.013857

Cited by 20 publications

(8 citation statements)

References 13 publications

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“…Some of these limitations include patient discomfort, physician compliance, time-consuming image acquisition, and the need for trained and experienced operator. Instrumentations and optical configurations that were conceptualized from fiber optics and bulk optics have been applied widely in bio-imaging and metrology [6][7][8][9][10][11][12][13][14][15][16][17][18] .…”

Section: Introductionmentioning

confidence: 99%

Contact lens assisted imaging with integrated flexible handheld probe for glaucoma diagnosis

Hong

Shinoj

Murukeshan³

et al. 2017

Fifth International Conference on Optical and Photonics Engineering

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Angle closure glaucoma accounts for majority of the bilateral blindness in Asian countries such as Singapore, China, and India. Abnormalities in the optic nerve and aqueous outflow system are the most indicative clinical hallmarks for glaucoma of this clinical subtype. Traditional photographic imaging techniques to assess the drainage angle are contact based, and may expose patients to risk of corneal abrasion and infections. In addition, these procedures require the use of viscous ophthalmic gels as coupling medium to overcome the phenomenon of total internal reflection at the tear-air interface. In this paper, we propose an integrated flexible handheld probe consisting of a micro color CCD video camera and white light LEDs. The handheld probe is able to capture images of the fundus and opposite iridocorneal angle when placed at the central cornea or limbus respectively. Here, we propose the use of hydrogel contact lens as an index matching medium and better protective barrier, as an alternative to conventional ophthalmic gels. The proposed imaging system and methodology has been successfully tested on porcine eye samples, ex vivo. With its high repeatability, reproducibility, and a good safety profile, it is believed that the proposed imaging system and methodology will complement existing imaging modalities in the diagnosis and management of glaucoma.

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Section: Introductionmentioning

confidence: 99%

Contact lens assisted imaging with integrated flexible handheld probe for glaucoma diagnosis

Hong

Shinoj

Murukeshan³

et al. 2017

Fifth International Conference on Optical and Photonics Engineering

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“…In a conventional laser interference lithography the feature size achievable is limited by the diffraction limit. A method to go beyond diffraction limit is to use the near filed interference based on Surface Plasmon Resonance in metal [3][4][5][6][7].This branch of near-field optical concepts for improving patterning resolution has started developing which have been receiving considerable attention for its ability to produce high density sub-wavelength features [8,9]. In this regard, these near filed techniques have been further explored to obtain smaller feature size, higher resolution and higher exposure depths in various configurations [10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Near-field assisted nanoscale patterning for improved absorption in thin film silicon solar cell

2014

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Near field optics concepts have introduced a paradigm shift in a wide variety of engineering fields in the recent past and the most significant applications of this fundamental physics concepts have been in the applied engineering problems such as improved broad band light absorption thereby enhancing the conversion efficiency of thin silicon solar cells. Also, for writing patterned structures or features using non contact optical methodologies have enabled near field optics assisted fabrication and related applications. The technology involving optics concepts and methodologies targeting energy sector have seen the impact of the same with a challenging trend to achieve smaller features or devices with micro-or nano-scale features. This demands automatically the need for achieving much smaller features beyond the forecasted sub-30nm feature patterning methodologies. To meet such demands, a new branch of near-field optical concepts for improving patterning resolution has started developing which have been receiving considerable attention for its ability to produce high density sub-wavelength features that can find tremendous energy harvesting applications. This paper in this context mainly focuses on the review of different near field optical concepts and approaches developed for patterning by the author's group at NTU. Different concepts were explored incorporating surface Plasmon waves ( LSPs, SPPs, LRSPs), gap modes as well as their interference in order to high resolution features and pattern dimensions at nano-scales. The absorbance of near band gap light is small and hence structuring of thin film solar cell is very important for increasing the absorbance by light trapping. The manuscript conclude by correlating the above said aspects and the challenges in achieving improved light conversion in thin film solar cells.

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“…[17][18][19] Nanoscale structures are reported to be highly signicant in biosensing applications. 20,21 Recently, metal nanoparticles have become extremely signicant in biosensing research owing to the generation of surface plasmon resonances (SPR). [22][23][24][25][26] Due to the high sensitivity of SPR towards local environmental changes, it serves as a feasible candidate for biosensing and imaging applications.…”

mentioning

confidence: 99%

Au nano-urchins enabled localized surface plasmon resonance sensing of beta amyloid fibrillation

et al. 2020

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Nano-scale three dimensional surface relief features using single exposure counterpropagating multiple evanescent waves interference phenomenon

Cited by 20 publications

References 13 publications

Contact lens assisted imaging with integrated flexible handheld probe for glaucoma diagnosis

Contact lens assisted imaging with integrated flexible handheld probe for glaucoma diagnosis

Near-field assisted nanoscale patterning for improved absorption in thin film silicon solar cell

Au nano-urchins enabled localized surface plasmon resonance sensing of beta amyloid fibrillation

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