Complex photothermal refractive index change in host-guest liquid crystals determined with a novel interferometric method

1997 ◽  
Vol 70 (19) ◽  
pp. 2544-2546 ◽  
Author(s):  
Hiroshi Ono ◽  
Nobuhiro Kawatsuki
Keyword(s):  
Refractive Index ◽  
Liquid Crystals ◽  
Refractive Index Change ◽  
Interferometric Method ◽  
Index Change

Effects of Cell Parameters on Photothermal Refractive Index Change in Guest Host Liquid Crystals

2000 ◽  
Vol 39 (Part 1, No. 11) ◽  
pp. 6376-6382 ◽  
Author(s):  
Hiroshi Ono ◽  
Yoshiro Harato ◽  
Junichi Kikuhara
Keyword(s):  
Refractive Index ◽  
Liquid Crystals ◽  
Refractive Index Change ◽  
Index Change ◽  
Cell Parameters

DETAILED CHARACTERISTICS OF PHOTOTHERMAL INDEX CHANGE IN GUEST-HOST LIQUID CRYSTALS

2002 ◽  
Vol 11 (03) ◽  
pp. 219-237 ◽  
Author(s):  
HIROSHI ONO
Keyword(s):  
Refractive Index ◽  
Liquid Crystal ◽  
Liquid Crystals ◽  
Phase Modulation ◽  
Refractive Index Change ◽  
Index Change ◽  
Self Phase Modulation ◽  
Cell Parameters ◽  
Analytical Technique ◽  
Crystal Cells

Detailed characteristics have been performed for optical nonlinearity originating in photothermal effects in guest-host liquid crystals. The effects of liquid crystal cell parameters and irradiation conditions on photothermal self-phase modulation and the resulting self-diffracted beam characteristics were quantitatively investigated by heat-conduction analysis and Kirchhoff's diffraction theory. We successfully explained all optical phenomena and our experimental and theoretical technique described here was useful for characterizing the photothermal self-phase modulation. This means that the photothermal mechanism was dominant in the laser-induced refractive index change in our guest-host liquid crystal cells and it is expected that our analytical technique described here will be useful for characterizing the extent to which the photothermal refractive-index change affects the laser-induced refractive index change in other kinds of guest-host liquid crystal cells in the future.

scholarly journals Critical angle reflection imaging for quantification of molecular interactions on glass surface

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Guangzhong Ma ◽  
Runli Liang ◽  
Zijian Wan ◽  
Shaopeng Wang
Keyword(s):  
Refractive Index ◽  
Small Molecule ◽  
Molecular Interactions ◽  
Glass Surface ◽  
Critical Angle ◽  
Dynamic Range ◽  
Refractive Index Change ◽  
Label Free ◽  
Index Change ◽  
Sensing Range

AbstractQuantification of molecular interactions on a surface is typically achieved via label-free techniques such as surface plasmon resonance (SPR). The sensitivity of SPR originates from the characteristic that the SPR angle is sensitive to the surface refractive index change. Analogously, in another interfacial optical phenomenon, total internal reflection, the critical angle is also refractive index dependent. Therefore, surface refractive index change can also be quantified by measuring the reflectivity near the critical angle. Based on this concept, we develop a method called critical angle reflection (CAR) imaging to quantify molecular interactions on glass surface. CAR imaging can be performed on SPR imaging setups. Through a side-by-side comparison, we show that CAR is capable of most molecular interaction measurements that SPR performs, including proteins, nucleic acids and cell-based detections. In addition, we show that CAR can detect small molecule bindings and intracellular signals beyond SPR sensing range. CAR exhibits several distinct characteristics, including tunable sensitivity and dynamic range, deeper vertical sensing range, fluorescence compatibility, broader wavelength and polarization of light selection, and glass surface chemistry. We anticipate CAR can expand SPR′s capability in small molecule detection, whole cell-based detection, simultaneous fluorescence imaging, and broader conjugation chemistry.

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