Bulletin of the American Physical Society, Mar 10, 2008
A process is demonstrated for tuning the magnetic resonance frequency of a fixed split-ring reson... more A process is demonstrated for tuning the magnetic resonance frequency of a fixed split-ring resonator array, by way of adding material near the split-ring elements. Applying drops of a silicon-nanospheres/ethanol solution to the surface of the sample decreases the magnetic resonance frequency of the split-ring array in incremental steps of 0.03 THz. This fine tuning is done post fabrication and is demonstrated to be reversible. The exhibited sensitivity of the split-ring resonance frequency to the presence of silicon nanospheres also suggests further application possibilities as a sensor device.
The 16th Annual Meeting of the IEEE Lasers and Electro-Optics Society, 2003. LEOS 2003., 2003
ABSTRACT This study explores multi-drop interconnections over point to point interconnections. Ho... more ABSTRACT This study explores multi-drop interconnections over point to point interconnections. However, high data rate point-to-point electrical transmission lines make multi-drop interconnections very difficult to implement at high speeds. For high speed multi-drop processor to memory interconnections, this paper proposes that optical interconnections offer a simple procedure to design and implement alternative to point to point electrical interconnections. The design complexity of these optical interconnections is similar to lower speed multi-drop electrical interconnections that are currently the dominant architectural implementation in current computing systems.
We present spectroscopic data for acute-angle reflection and transmission of two planar metamater... more We present spectroscopic data for acute-angle reflection and transmission of two planar metamaterial samples, one at microwave frequencies and one at far-infrared frequencies. We show that the observed evolution of the magnetic resonance with the increasing angle of incidence is in quantitative agreement with the Fresnel expressions. This finding uncovers a convenient approach towards the retrieval of optical constants of
Summaries of Papers Presented at the Lasers and Electro-Optics. CLEO '02. Technical Diges, 2002
Summary form only given. We report demonstrations of optical interconnections on foundry Si CMOS ... more Summary form only given. We report demonstrations of optical interconnections on foundry Si CMOS circuits using polymer optical waveguides. The polymer optical waveguides were directly fabricated on two Si CMOS circuits. The cladding/planarization layer was benzocyclobutene (BCB) and polyetherimide (ULTEM) was used as the waveguide core material.
Digest of the LEOS Summer Topical Meetings Biophotonics/Optical Interconnects and VLSI Photonics/WBM Microcavities, 2004., 2004
In this paper, the first embedded optical interconnection using separately grown and fabricated, ... more In this paper, the first embedded optical interconnection using separately grown and fabricated, heterogeneously integrated thin film lasers and thin film photodetectors that are connected with a polymer waveguide is demonstrated.
53rd Electronic Components and Technology Conference, 2003. Proceedings., 2003
Optical interconnections with embedded photodetectors integrated onto printed wiring boards (PWB)... more Optical interconnections with embedded photodetectors integrated onto printed wiring boards (PWB) have been demonstrated. High performance FR-4 was chosen as the substrate after several commercial products were examined in terms of their heat resistance and surface roughness. High performance FR-4 enables the use of higher curing temperatures for the waveguide materials than standard FR-4. One dominant issue in optical interconnections
Digest of the LEOS Summer Topical Meetings Biophotonics/Optical Interconnects and VLSI Photonics/WBM Microcavities, 2004., 2004
In this paper, the first report of a photodetector embedded in a polymer waveguide with output to... more In this paper, the first report of a photodetector embedded in a polymer waveguide with output to a Si-Ge transimpedance amplifier is reported. This system was tested with an endfire coupled optical input to the multimode polymer waveguide, and, through direct coupling of this light to the photodetector from the waveguide followed by photodetector current output to a Maxim Si-Ge
LEOS 2007 - IEEE Lasers and Electro-Optics Society Annual Meeting Conference Proceedings, 2007
Thin film InGaAs/GaAsP lasers with strained single quantum well active regions have been bonded t... more Thin film InGaAs/GaAsP lasers with strained single quantum well active regions have been bonded to Si and tested. The thin film laser structure was designed and grown with no net strain using strain compensation.
A high-fill factor/high-SNR CMOS readout integrated circuit (ROIC) array is designed for high dyn... more A high-fill factor/high-SNR CMOS readout integrated circuit (ROIC) array is designed for high dynamic range infrared imaging systems. The designed ROIC array uses a single reference photodiode that is routed to each unit cell in the array to subtract the dark current for high SNR and high fill factor. The achieved average SNR is 80 dB and the fill factor
Bulletin of the American Physical Society, Mar 10, 2008
A process is demonstrated for tuning the magnetic resonance frequency of a fixed split-ring reson... more A process is demonstrated for tuning the magnetic resonance frequency of a fixed split-ring resonator array, by way of adding material near the split-ring elements. Applying drops of a silicon-nanospheres/ethanol solution to the surface of the sample decreases the magnetic resonance frequency of the split-ring array in incremental steps of 0.03 THz. This fine tuning is done post fabrication and is demonstrated to be reversible. The exhibited sensitivity of the split-ring resonance frequency to the presence of silicon nanospheres also suggests further application possibilities as a sensor device.
The 16th Annual Meeting of the IEEE Lasers and Electro-Optics Society, 2003. LEOS 2003., 2003
ABSTRACT This study explores multi-drop interconnections over point to point interconnections. Ho... more ABSTRACT This study explores multi-drop interconnections over point to point interconnections. However, high data rate point-to-point electrical transmission lines make multi-drop interconnections very difficult to implement at high speeds. For high speed multi-drop processor to memory interconnections, this paper proposes that optical interconnections offer a simple procedure to design and implement alternative to point to point electrical interconnections. The design complexity of these optical interconnections is similar to lower speed multi-drop electrical interconnections that are currently the dominant architectural implementation in current computing systems.
We present spectroscopic data for acute-angle reflection and transmission of two planar metamater... more We present spectroscopic data for acute-angle reflection and transmission of two planar metamaterial samples, one at microwave frequencies and one at far-infrared frequencies. We show that the observed evolution of the magnetic resonance with the increasing angle of incidence is in quantitative agreement with the Fresnel expressions. This finding uncovers a convenient approach towards the retrieval of optical constants of
Summaries of Papers Presented at the Lasers and Electro-Optics. CLEO '02. Technical Diges, 2002
Summary form only given. We report demonstrations of optical interconnections on foundry Si CMOS ... more Summary form only given. We report demonstrations of optical interconnections on foundry Si CMOS circuits using polymer optical waveguides. The polymer optical waveguides were directly fabricated on two Si CMOS circuits. The cladding/planarization layer was benzocyclobutene (BCB) and polyetherimide (ULTEM) was used as the waveguide core material.
Digest of the LEOS Summer Topical Meetings Biophotonics/Optical Interconnects and VLSI Photonics/WBM Microcavities, 2004., 2004
In this paper, the first embedded optical interconnection using separately grown and fabricated, ... more In this paper, the first embedded optical interconnection using separately grown and fabricated, heterogeneously integrated thin film lasers and thin film photodetectors that are connected with a polymer waveguide is demonstrated.
53rd Electronic Components and Technology Conference, 2003. Proceedings., 2003
Optical interconnections with embedded photodetectors integrated onto printed wiring boards (PWB)... more Optical interconnections with embedded photodetectors integrated onto printed wiring boards (PWB) have been demonstrated. High performance FR-4 was chosen as the substrate after several commercial products were examined in terms of their heat resistance and surface roughness. High performance FR-4 enables the use of higher curing temperatures for the waveguide materials than standard FR-4. One dominant issue in optical interconnections
Digest of the LEOS Summer Topical Meetings Biophotonics/Optical Interconnects and VLSI Photonics/WBM Microcavities, 2004., 2004
In this paper, the first report of a photodetector embedded in a polymer waveguide with output to... more In this paper, the first report of a photodetector embedded in a polymer waveguide with output to a Si-Ge transimpedance amplifier is reported. This system was tested with an endfire coupled optical input to the multimode polymer waveguide, and, through direct coupling of this light to the photodetector from the waveguide followed by photodetector current output to a Maxim Si-Ge
LEOS 2007 - IEEE Lasers and Electro-Optics Society Annual Meeting Conference Proceedings, 2007
Thin film InGaAs/GaAsP lasers with strained single quantum well active regions have been bonded t... more Thin film InGaAs/GaAsP lasers with strained single quantum well active regions have been bonded to Si and tested. The thin film laser structure was designed and grown with no net strain using strain compensation.
A high-fill factor/high-SNR CMOS readout integrated circuit (ROIC) array is designed for high dyn... more A high-fill factor/high-SNR CMOS readout integrated circuit (ROIC) array is designed for high dynamic range infrared imaging systems. The designed ROIC array uses a single reference photodiode that is routed to each unit cell in the array to subtract the dark current for high SNR and high fill factor. The achieved average SNR is 80 dB and the fill factor
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Papers by Sang-Yeon Cho