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An important property of electromagnetic fields which is partly responsible for the interaction between fields and chiral medium is called optical chirality. By enhancing this field property while maintaining constant input power, we are able to increase absorption of circularly polarized light by chiral molecules of a certain handedness. This enhancement is achieved through the use of plasmonic nano-particles...
Design considerations for an off-axis parabolic mirror based THz imaging systems are presented. The distortion of THz field and its polarization profile are shown for two different configurations of off-axis parabolic mirror trains. The field and polarization distortions along the propagation path are compared with different f/# mirrors. The distortion effects were cancelled out by symmetric orientation...
Engineering of highly-focused electromagnetic field has important applications in many areas including microscopic imaging, probing and controlling of particles, laser micromachining and so on. For an incident cylindrically vector beam, the strong focused field can be understood as the reversing of the field radiated by electric or magnetic dipole in the focal volume of a high numerical aperture (NA)...
A miniature optical imaging probe based on a high-fill-factor MEMS mirror has been developed for nondestructive diagnosis of articular joint diseases and injuries. The MEMS mirror scans plusmn30deg at less than 6 V in both x- and y-axis. The outer diameter of the probe is 5.8 mm. Three-dimensional polarization-sensitive optical coherence tomography of canine meniscus has been successfully demonstrated.
The polarization mismatch of the sample and reference arms in optical fiber based low coherence interferometry has critical effect on its depth resolution when the light source is partially polarized: When the polarization states of the two arms are matched the measured point spread function (PSF) is almost identical to the theoretical prediction; When their polarization states are mismatched the...
The authors have researched support system of the reminiscence and life review activity. This support system consists of an interactive tabletop display and interface system. On the reminiscence and life review activity, a therapist puts pictures on the table so as to trigger a talk. However some observers may perceive upside down images if they sit down opposite the therapist. To overcome this problem,...
Optical Coherence Tomography (OCT) is a well known technique for creating non-invasive, high resolution images of biological microstructure. OCT has matured into animportant imaging modality since its invention in 1991. The popularity of the method lies in the numerous advantages that it offers high detection sensitivity allowing fast imaging speed, andhigh spatial resolution. In this paper we propose...
A new idea of the optical fiber coherence tomography system designed for medical application is presented in this paper. Application as a source the femtosecond 400 mW Ti:Al2O3 pulse laser operates at wavelength 798 nm with spectral pulse bandwidth about 145 nm provides the longitudinal resolution about 2 mum. The system can be used for scanning the interior of a human body owing to application of...
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