Extension of energy band gap in ternary photonic crystal using left-handed materials

We investigate the extension of energy band gap in one-dimensional ternary photonic crystal. We assume one of the layers constituting the ternary photonic crystal to be left-handed material (LHM) of simultaneously negative electric permittivity and magnetic permeability. The photonic crystal has the structure dielectric/LHM/dielectric. We show in this work, the energy band gap in one-dimensional ternary photonic crystal can be dramatically enlarged with the increase of the LHM layer thickness. Moreover, it can also be enlarged with the decrease of both the negative permittivity and permeability of the LHM layer. The effects of the angle of incidence and the number of layers are also investigated

Photonic crystal with epsilon negative and double negative materials as an optical sensor

Two ternary photonic crystals are proposed for sensing applications. The first one is composed of an air layer as an analyte sandwiched between two double negative material (DNM) layers whereas the second one consists of an air layer sandwiched between two epsilon negative material (ENM) layers. The transmission spectrum is studied for two different values of the refractive index of the analyte layer with ∆n = 0.01. A specific peak in the transmission spectrum is observed and the wavelength at which the peak occurs is determined. The wavelength shift due to any change in the index of the analyte layer is also determined. The effect of varying the parameters of the DNM and ENM on the sensitivity of the sensor is discussed. It is found that the sensitivity of the structure ENM/air/ENM is much greater than that of the structure DNM/air/DNM and it is estimated as 26 times of the sensitivity of the latter structure

تصميم بلورة ضوئية أحادية البعد قائمة على عيوب مع مكونات مواد فائقة التوصيل لتطبيقات الاستشعار الحيوي

A novel biosensor based on 1-D defect photonic crystal is suggested to be consisting of alternate layers of SiO2 and Air. At the middle, there exists a cavity layer encapsulated with a composite layer of superconducting and dielectric materials. The blood samples are infiltrated in the cavity. The sensitivity is calculated at different parameters including filling factor of superconducting materials, the temperature, and the width of the cavity. Results indicate that the sensitivity decrease slightly as temperature increases and sensitivity increases as filling factor increases and thickness of cavity increases.A novel biosensor based on 1-D defect photonic crystal is suggested to be consisting of alternate layers of SiO2 and Air. At the middle, there exists a cavity layer encapsulated with a composite layer of superconducting and dielectric materials. The blood samples are infiltrated in the cavity. The sensitivity is calculated at different parameters including filling factor of superconducting materials, the temperature, and the width of the cavity. Results indicate that the sensitivity decrease slightly as temperature increases and sensitivity increases as filling factor increases and thickness of cavity increases

تصميم مستشعر معامل الانكسار ذي الأبعاد باستخدام دليل الموجات البلورية الضوئية الثلاثية لتطبيقات عينات دم البلازما

One dimensional ternary photonic crystal based refractive index sensor is numerically proposed for the blood plasma sensing applications. It is achieved by introducing the defects or cavity cell, where the blood samples are infiltrated and surrounded by the graphene layers at the middle region of the ternary structures. Introduction of the graphene layer is to avoid the change in blood sample characteristics due to few ambient factors. The whole structure is then tuned to observe the transmittance spectrum over the infrared region (800 nm–1200 nm). It is noticed that the resonance spectral shift occurs for variation of the blood plasma samples as 10 g/l, 20 g/l, 30 g/l, 40 g/l & 50 g/l. These spectral shifts report the device sensitivity and it is optimized for different filling factor of nanocomposite material and different thickness of the graphene coating.One dimensional ternary photonic crystal based refractive index sensor is numerically proposed for the blood plasma sensing applications. It is achieved by introducing the defects or cavity cell, where the blood samples are infiltrated and surrounded by the graphene layers at the middle region of the ternary structures. Introduction of the graphene layer is to avoid the change in blood sample characteristics due to few ambient factors. The whole structure is then tuned to observe the transmittance spectrum over the infrared region (800 nm–1200 nm). It is noticed that the resonance spectral shift occurs for variation of the blood plasma samples as 10 g/l, 20 g/l, 30 g/l, 40 g/l & 50 g/l. These spectral shifts report the device sensitivity and it is optimized for different filling factor of nanocomposite material and different thickness of the graphene coating

Enhanced sensitivity of cancer cell using one dimensional nano composite material coated photonic crystal

We theoretically analyze the detection of a cancer cell in the one-dimensional photonic crystal by infiltrating different sample cells in the cavity layer. The defect modes appear in their transmission spectra only if the nanocomposite layers are included on either side of the cavity layer. This analysis is carried out by a dielectric constant and the transmittance peak of the cancer cell is compared with the normal cell. The transmittance peak shifts are analyzed with various filling factors for optimization purposes. Through the shifting spectrum, the sensitivity of cancer cell from the normal cell is obtained from a minimum of 42 nm/RIU to a maximum of 43 nm/RIU