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JournalISSN: 1687-9384

International Journal of Optics 

Hindawi Publishing Corporation
About: International Journal of Optics is an academic journal published by Hindawi Publishing Corporation. The journal publishes majorly in the area(s): Laser & Optical fiber. It has an ISSN identifier of 1687-9384. It is also open access. Over the lifetime, 387 publications have been published receiving 2917 citations. The journal is also known as: IJO.


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Journal ArticleDOI
TL;DR: In this article, different studies on weather conditions and techniques employed to mitigate their effect are discussed in FSO, which can be used for communication purpose in hours and in lesser economy.
Abstract: FSO is a communication system where free space acts as medium between transceivers and they should be in LOS for successful transmission of optical signal. Medium can be air, outer space, or vacuum. This system can be used for communication purpose in hours and in lesser economy. There are many advantages of FSO like high bandwidth and no spectrum license. The transmission in FSO is dependent on the medium because the presence of foreign elements like rain, fog, and haze, physical obstruction, scattering, and atmospheric turbulence are some of these factors. Different studies on weather conditions and techniques employed to mitigate their effect are discussed in this paper.

203 citations

Journal ArticleDOI
TL;DR: Research results have shown great potential for OCT in endoscopic imaging by incorporating MEMS scanning mirrors in MEMS-OCT designs, and their imaging results are reviewed in the paper.
Abstract: Early cancer detection has been playing an important role in reducing cancer mortality. Optical coherence tomography (OCT), due to its micron-scale resolution, has the ability to detect cancerous tissues at their early stages. For internal organs, endoscopic probes are needed as the penetration depth of OCT is about 1–3 mm. MEMS technology has the advantages of fast speed, small size, and low cost, and it has been widely used as the scanning engine in endoscopic OCT probes. Research results have shown great potential for OCT in endoscopic imaging by incorporating MEMS scanning mirrors. Various MEMS-OCT designs are introduced, and their imaging results are reviewed in the paper.

58 citations

Journal ArticleDOI
TL;DR: The efficacy of the proposed scheme is verified by computing mean-squared-error (MSE) between the recovered and the original images, and the scheme’s sensitivity to the encryption parameters is investigated and its robustness against occlusion and noise attacks is examined.
Abstract: We have carried out a study of optical image encryption in the Fresnel transform () domain, using a random phase mask (RPM) in the input plane and a phase mask based on devil’s vortex toroidal lens (DVTL) in the frequency plane. The original images are recovered from their corresponding encrypted images by using the correct parameters of the and the parameters of DVTL. The use of a DVTL-based structured mask enhances security by increasing the key space for encryption and also aids in overcoming the problem of axis alignment associated with an optical setup. The proposed encryption scheme is a lensless optical system and its digital implementation has been performed using MATLAB 7.6.0 (R2008a). The scheme has been validated for a grayscale and a binary image. The efficacy of the proposed scheme is verified by computing mean-squared-error (MSE) between the recovered and the original images. We have also investigated the scheme’s sensitivity to the encryption parameters and examined its robustness against occlusion and noise attacks.

58 citations

Journal ArticleDOI
TL;DR: In this article, a tutorial-cum-review-type article is presented to explain the relation between scalar fields and Stokes fields and the singularities in each of them, where the authors demonstrate this by theoretically and experimentally generating polarization singularities using phase singularities.
Abstract: Polarization singularities are superpositions of orbital angular momentum (OAM) states in orthogonal circular polarization basis. The intrinsic OAM of light beams arises due to the helical wavefronts of phase singularities. In phase singularities, circulating phase gradients and, in polarization singularities, circulating Stokes phase gradients are present. At the phase and polarization singularities, undefined quantities are the phase and Stokes phase, respectively. Conversion of circulating phase gradient into circulating Stokes phase gradient reveals the connection between phase (scalar) and polarization (vector) singularities. We demonstrate this by theoretically and experimentally generating polarization singularities using phase singularities. Furthermore, the relation between scalar fields and Stokes fields and the singularities in each of them is discussed. This paper is written as a tutorial-cum-review-type article keeping in mind the beginners and researchers in other areas, yet many of the concepts are given novel explanations by adopting different approaches from the available literature on this subject.

56 citations

Journal ArticleDOI
TL;DR: In this paper, the authors reviewed the development of surface-enhanced Raman scattering (SERS) sensors with emphasis on the recent work on SERS sensors utilizing hollow-core photonic crystal fibers (HCPCFs).
Abstract: Photonic crystal fiber (PCF) sensors based on surface-enhanced Raman scattering (SERS) have become increasingly attractive in chemical and biological detections due to the molecular specificity, high sensitivity, and flexibility. In this paper, we review the development of PCF SERS sensors with emphasis on our recent work on SERS sensors utilizing hollow-core photonic crystal fibers (HCPCFs). Specifically, we discuss and compare various HCPCF SERS sensors, including the liquid-filled HCPCF and liquid-core photonic crystal fibers (LCPCFs). We experimentally demonstrate and theoretically analyze the high sensitivity of the HCPCF SERS sensors. Various molecules including Rhodamine B, Rhodamine 6G, human insulin, and tryptophan have been tested to show the excellent performance of these fiber sensors.

48 citations

Performance
Metrics
No. of papers from the Journal in previous years
YearPapers
202313
202231
202141
202048
201935
201826