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Optical Filters Based on Waveguide Grating Structures

Author: LiRui
Tutor: ZhangXinPing
School: Beijing University of Technology
Course: Optics
Keywords: Optical filter Waveguide coupling grating Waveguide resonance mode Interference lithography
CLC: TN713
Type: Master's thesis
Year: 2010
Downloads: 94
Quote: 0
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Abstract


Waveguide coupling grating by the backing layer, the waveguide layer and the grating layer consisting of a composite structure. Its basic physical mechanism is the grating diffraction into the waveguide propagation of light, when its is grating further diffraction generating multi-beam diffraction light, it with the directly transmitted light occurrence of destructive interference, forming a narrowband extinction signals in the transmission spectrum, i.e. generated waveguide resonance mode. The waveguide coupling grating and metal materials combined with metal photonic crystal waveguide coupler can be prepared. The waveguide coupling metallic photonic crystal, the incident light satisfies a certain condition can be excited metal surface plasma resonance phenomena and the strong coupling occurs with the waveguide mode, so that the sample showing the unique optical response characteristics. The production of optical components based waveguide coupling metallic photonic crystal structure can be widely applied in the field of optical filtering, biosensing, photonics technology. In this paper, on the basis of the introduction of a metal surface plasmon resonance and the waveguide coupling grating optical filter characteristic, introduced by laser interference lithography prepared by large-area, homogeneous structure of the ternary waveguide coupling grating and micron large cycle waveguide coupling grating structure. Found through the study of their optical properties: (1) periodic waveguide coupler grating has a different period of nanoscale waveguide coupling grating anomalous transmission phenomenon. Its angle-resolved extinction spectra in addition with narrowband extinction signal was observed in the the waveguide coupler nano grating spectrometer, also appeared with the angle tuning enhanced transmission signal. (2) ternary waveguide coupling grating there are three different cycles grating combination of a waveguide resonance mode, with the continuous change of the incident angle size, its signal response range can be covered to the entire visible region. The response characteristics of the three sets of waveguide resonance signal mode while tuning spectroscopy has the potential to greatly increase the sensitivity of the test based on the ternary waveguide coupled grating structure biosensors. Finally, we introduce a combined solution prepared waveguide coupling metallic photonic crystals using interference lithography process, and its response characteristics of spectroscopy. These experimental results with theoretical explanation, to further explore the idea of ??the waveguide coupled devices used in optical filtering, biosensing technology has important reference value for the design of high sensitivity, stable performance, adjustable parameters optoelectronic devices.

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Basic electronic circuits > Filtering techniques,the filter
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