Graphene plasmons have become promising candidates for deep-subwavelength nanoscale optical devices due to their strong field confinement and low damping. Among these nanoscale optical devices, band-pass filter for wa...Graphene plasmons have become promising candidates for deep-subwavelength nanoscale optical devices due to their strong field confinement and low damping. Among these nanoscale optical devices, band-pass filter for wavelength selection and noise filtering are key devices in an integrated optical circuit. However, plasmonic filters are still oversized because large resonant cavities are needed to perform frequency selection. Here, an ultra-compact filter integrated in a graphene plasmonic waveguide was designed, where a rectangular resonant cavity is inside a graphene nanoribbon waveguide. The properties of the filter were studied using the finite-difference time-domain method and demonstrated using the analytical model. The results demonstrate the band-pass filter has a high quality factor（20.36） and electrically tunable frequency response. The working frequency of the filter could also be tuned by modifying the cavity size. Our work provides a feasible structure for a graphene plasmonic nano-filter for future use in integrated optical circuits.展开更多
Monitoring the chemical and structural changes in protein side chains and endpoints by infrared(IR)spectroscopy is important for studying the chemical reaction and physical adsorption process of proteins.However,the d...Monitoring the chemical and structural changes in protein side chains and endpoints by infrared(IR)spectroscopy is important for studying the chemical reaction and physical adsorption process of proteins.However,the detection of side chains and endpoints in nanoscale proteins is still challenging due to its weak IR response.Here,by designing a double layered graphene plasmon sensor on MgF2/Si substrate in the IR fingerprint region,we detect the vibrational modes in side chains and endpoints(1397 cm^-1 and 1458 cm^-1)of monolayer protein.The sensor could be applied on biochemistry to investigate the physical and chemical reaction of biomolecules.展开更多
Dear Editor,Melanoma,squamous cell carcinoma(SCC),and basal cell carcinoma(BCC)are three major types of skin cancer.Among them,melanoma is the most severe form and accounts for~4%of all newly diagnosed cancers annuall...Dear Editor,Melanoma,squamous cell carcinoma(SCC),and basal cell carcinoma(BCC)are three major types of skin cancer.Among them,melanoma is the most severe form and accounts for~4%of all newly diagnosed cancers annually in the United States.It is estimated that approximately 9500 people are diagnosed with skin cancer every day,and more than 1 million Americans are living with melanoma.Melanoma treatment is still a major challenge in the clinic.Photodynamic therapy(PDT)is composed of targeted ablation and immune activation,is less invasive than other therapies and has been widely used in the treatment of various cancers.展开更多
基金Project supported by the National Basic Key Research Program of China(Grant No.2015CB932400)the National Key Research and Development Program of China(Grant No.2016YFA0201600)+2 种基金the National Natural Science Foundation of China(Grant Nos.51372045,11504063,and 11674073)the Key Program of the Bureau of Frontier Sciences and Education,Chinese Academy of Sciences(Grant No.QYZDBSSW-SLH021)the Science and Technology Projects of Beijing City,China(Grant No.Z161100002116016)
文摘Graphene plasmons have become promising candidates for deep-subwavelength nanoscale optical devices due to their strong field confinement and low damping. Among these nanoscale optical devices, band-pass filter for wavelength selection and noise filtering are key devices in an integrated optical circuit. However, plasmonic filters are still oversized because large resonant cavities are needed to perform frequency selection. Here, an ultra-compact filter integrated in a graphene plasmonic waveguide was designed, where a rectangular resonant cavity is inside a graphene nanoribbon waveguide. The properties of the filter were studied using the finite-difference time-domain method and demonstrated using the analytical model. The results demonstrate the band-pass filter has a high quality factor（20.36） and electrically tunable frequency response. The working frequency of the filter could also be tuned by modifying the cavity size. Our work provides a feasible structure for a graphene plasmonic nano-filter for future use in integrated optical circuits.
基金supported by the National Basic Key Research Program of China(No.2015CB932400)the National Key Research and Development Program of China(No.2016YFA0201600)+4 种基金the National Natural Science Foundation of China(Nos.11504063,11674073,11704085,and 11427808)the Bureau of International Cooperationthe Key Program of the Bureau of Frontier Sciences and Education,Chinese Academy of Sciences(No.QYZDB-SSW-SLH021)the Key Project of Chinese Academy of Sciences(No.ZDBS-SSW-JSC002)the Youth Innovation Promotion Association CAS
文摘Monitoring the chemical and structural changes in protein side chains and endpoints by infrared(IR)spectroscopy is important for studying the chemical reaction and physical adsorption process of proteins.However,the detection of side chains and endpoints in nanoscale proteins is still challenging due to its weak IR response.Here,by designing a double layered graphene plasmon sensor on MgF2/Si substrate in the IR fingerprint region,we detect the vibrational modes in side chains and endpoints(1397 cm^-1 and 1458 cm^-1)of monolayer protein.The sensor could be applied on biochemistry to investigate the physical and chemical reaction of biomolecules.
基金supported by the National Natural Science Foundation of China through No.81872320,31600730,81602496,and 81272317the Innovation and University Promotion Project of Guangdong Pharmaceutical University through No.2017KCXTD020.W.C.
文摘Dear Editor,Melanoma,squamous cell carcinoma(SCC),and basal cell carcinoma(BCC)are three major types of skin cancer.Among them,melanoma is the most severe form and accounts for~4%of all newly diagnosed cancers annually in the United States.It is estimated that approximately 9500 people are diagnosed with skin cancer every day,and more than 1 million Americans are living with melanoma.Melanoma treatment is still a major challenge in the clinic.Photodynamic therapy(PDT)is composed of targeted ablation and immune activation,is less invasive than other therapies and has been widely used in the treatment of various cancers.
