Dr. Nicholas Madamopoulos Profile

Dr. Nicholas Madamopoulos

Associate Professor at City College of New York

SPIE Involvement:

Conference Program Committee | Author

Publications (29)

PROCEEDINGS ARTICLE | June 7, 2013

High performance microring resonator (MRR)-based optical filter with reduced group delay and simplified center-wavelength control

Proc. SPIE. 8883, ICPS 2013: International Conference on Photonics Solutions

KEYWORDS: Optical components, Optical filters, Resonators, Waveguides, Photonics, Integrated optics, Picosecond phenomena, Chemical elements, Optical isolators, Microrings

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PROCEEDINGS ARTICLE | June 7, 2013

Prismatic louver active façades for natural illumination and thermal energy gain in high-rise and commercial buildings

Proc. SPIE. 8883, ICPS 2013: International Conference on Photonics Solutions

KEYWORDS: Prisms, Solar energy, Sun, Glasses, Solar cells, Coating, Buildings, Light sources and illumination, Solar radiation, Liquids

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High-rise and commercial buildings in urban centers present a great challenge in terms of their energy consumption. Due to maximization of rentable square footage, the preferred urban façade system over the past 50 years has been the “curtain wall”, only a few inches thick and comprised of modular steel or aluminum framing and predominant glass infills. The perceived Achilles heel of these modern glass façade systems is their thermal inefficiency: They are inadequate thermal barriers and exhibit excessive solar gain. The excessive solar gain has a negative impact on lighting and cooling loads of the entire building. This negative impact will be further exacerbated with rising energy costs. However, rather than view the glass façade’s uncontrolled solar gain merely as a weakness contributing to higher energy consumption, the condition could indeed be considered as related to an energy solution. These glass façades can be retrofitted to operate as a provider of daylight and energy for the rest of the building, taking advantage of the overexposure to the sun. With today’s technology, the sun’s abundant renewable energy can be the driving force for the energy transition of these building envelopes. Illumination, thermal energy, and electricity production can be directly supplied from the sun, and when correctly and efficiently managed, they can lead to a significantly less energy-intensive building stock. We propose a multi-purpose, prismatic, louver-based façade to perform both daylight and thermal energy harvesting with a goal of offering a better daylight environment for the occupants, and reduce the energy consumption and carbon footprint of the building. While decentralized air-conditioning units are commonly accepted as façade “plug-ins”, such decentralization could be utilized with more benefits by passively managing the interior space conditions, without using any extra power. Just as living organisms respond and adapt to the environmental changes in their surroundings, the proposed multi-purpose prismatic louver façade can be responsive and resilient to daytime sky conditions, environmental temperatures and occupant needs by exploiting options presented by the three sides of the prismatic louvers. The façade is highly configurable since every side of the prismatic louver façade can perform a different operation. The prism itself operates as a redirector of sunlight from the glass façade to the ceiling and consequently diffuses the sunlight throughout the room, providing higher and more uniform illumination levels. In addition, each side of the prismatic louver can be implemented in multiple ways (e.g., visibly transparent photovoltaic cells, luminescent solar concentrators). The ability to rotate the prismatic louvers along their axes allows the user to expose a set of different surfaces to the sun’s radiation in accordance with different climatic conditions and occupant needs. Thus, the prismatic louvers help achieve a selective control and management of the incoming light that allows us to manipulate the incoming energy for the benefit of the building and its occupants.

PROCEEDINGS ARTICLE | June 7, 2013

Interferometric modulator with phase-modulating and cavity-modulating components (IMPACC) for high linearity microwave applications: technology review

Proc. SPIE. 8883, ICPS 2013: International Conference on Photonics Solutions

KEYWORDS: Phase modulation, Modulation, Resonators, Waveguides, Modulators, Phase interferometry, Photonics, Analog electronics, Optical modulators, Microwave radiation

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PROCEEDINGS ARTICLE | January 25, 2012

Adjustable transfer function optical filter for microwave applications

Proc. SPIE. 8282, Broadband Access Communication Technologies VI

KEYWORDS: Optical components, Optical filters, Mirrors, Resonators, Polarization, Interferometers, Reflectivity, Microwave radiation, Filtering (signal processing), Microwave photonics

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PROCEEDINGS ARTICLE | January 25, 2012

Power balancing effect on the performance of IMPACC modulator under critical coupling (CC), over coupling (OC), and under coupling (UC) conditions at high frequency

Proc. SPIE. 8282, Broadband Access Communication Technologies VI

KEYWORDS: Modulation, Resonators, Waveguides, Electrodes, Phase shift keying, Modulators, Phase interferometry, Frequency modulation, Optics manufacturing

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PROCEEDINGS ARTICLE | January 24, 2011

Crosstalk analysis of an extended reach hybrid tree-ring PON architecture

Proc. SPIE. 7958, Broadband Access Communication Technologies V

KEYWORDS: Thin films, Optical filters, Fiber to the x, Passive optical networks, Wavelength division multiplexing, Receivers, Optical switching, Local area networks, Tolerancing, Network architectures

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PROCEEDINGS ARTICLE | January 24, 2011

Inherent RF linearized bandwidth broadening capability of an ultra-linear optical modulator

Proc. SPIE. 7958, Broadband Access Communication Technologies V

KEYWORDS: Phase modulation, Modulation, Waveguides, Manufacturing, Phase shift keying, Modulators, Phase interferometry, Optical modulators, Resonance enhancement

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PROCEEDINGS ARTICLE | January 23, 2010

Analysis of the spectrum characteristics of a super linear optical modulator

Proc. SPIE. 7620, Broadband Access Communication Technologies IV

KEYWORDS: Phase modulation, Modulation, Resonators, Electrodes, Phase shift keying, Modulators, Optical modulators, Signal detection, Intermodulation, Beam propagation method

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PROCEEDINGS ARTICLE | January 26, 2009

PON ring architectures for truly shared LAN capability and dynamic bandwidth allocation for fiber wireless (FiWi) applications

Proc. SPIE. 7234, Broadband Access Communication Technologies III

KEYWORDS: Fiber to the x, Passive optical networks, Wavelength division multiplexing, Receivers, Antennas, Optical switching, Time division multiplexing, Local area networks, Multiplexers, Network architectures

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PROCEEDINGS ARTICLE | January 26, 2009

Super-linear modulator with extended bandwidth capability for broadband access applications

Proc. SPIE. 7234, Broadband Access Communication Technologies III

KEYWORDS: Phase modulation, Modulation, Resonators, Electrodes, Manufacturing, Radio over Fiber, Phase shift keying, Modulators, Optical modulators, Beam propagation method

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PROCEEDINGS ARTICLE | September 10, 2007

Large optical 3D MEMS switches in access networks

Proc. SPIE. 6776, Broadband Access Communication Technologies II

KEYWORDS: Microelectromechanical systems, Switches, Fiber to the x, Signal attenuation, Copper, Networks, Diagnostics, Passive optical networks, 3D metrology, Network architectures

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PROCEEDINGS ARTICLE | October 17, 2006

NiCl2/SiO2 sol-gel material for ammonia sensing

Proc. SPIE. 6377, Advanced Environmental, Chemical, and Biological Sensing Technologies IV

KEYWORDS: Thin films, Environmental monitoring, Sensors, Composites, Humidity, Photonics, Transmittance, Absorbance, Sol-gels, Environmental sensing

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PROCEEDINGS ARTICLE | October 2, 2006

Performance analysis of the ultralinear optical intensity modulator

Proc. SPIE. 6390, Broadband Access Communication Technologies

KEYWORDS: Phase modulation, Modulation, Resonators, Manufacturing, Modulators, Telecommunications, Analog electronics, Optical modulators, Tolerancing, Optics manufacturing

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PROCEEDINGS ARTICLE | November 17, 2005

Diffractive optical elements for photonic gas sensors

Proc. SPIE. 6008, Nanosensing: Materials and Devices II

KEYWORDS: Oxides, Photodetectors, Diffraction, Optical design, Sensors, Etching, Argon, Refraction, Reactive ion etching, Diffraction gratings

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PROCEEDINGS ARTICLE | November 8, 2005

Polymer-based photonic sensors for physicochemical monitoring

Proc. SPIE. 5993, Advanced Environmental, Chemical, and Biological Sensing Technologies III

KEYWORDS: Photodetectors, Sensors, Polymers, Water, Matrices, Glasses, Cobalt, Humidity, Polymer thin films, Polymeric sensors

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PROCEEDINGS ARTICLE | October 25, 2005

Semiconductor optical amplifier-based switched photonic delay lines for microwave photonic applications

Proc. SPIE. 6012, Optical Transmission Systems and Equipment for WDM Networking IV

KEYWORDS: Semiconductors, Optical components, Switches, Switching, Wavelength division multiplexing, Antennas, Phased arrays, Optical networks, Phased array optics, Microwave photonics

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PROCEEDINGS ARTICLE | October 25, 2005

Super-linear optical modulator technologies for optical broadband access network: development and potential

Proc. SPIE. 6012, Optical Transmission Systems and Equipment for WDM Networking IV

KEYWORDS: Optical amplifiers, Phase modulation, Modulation, Fiber optics, Modulators, Fiber lasers, Telecommunications, Analog electronics, Optical modulators, Tolerancing

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PROCEEDINGS ARTICLE | September 28, 2005

Optical fiber long-period grating humidity sensor utilizing PEO/CoCl₂ outcladding overlayers

Proc. SPIE. 5952, Optical Fibers: Applications

KEYWORDS: Optical fibers, Refractive index, Fiber optics, Cladding, Sensors, Polymers, Water, Fiber optics sensors, Humidity, Environmental sensing

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PROCEEDINGS ARTICLE | August 19, 2003

Photonic delay lines using wavelength-selective optical network elements and Optiflex technology

Proc. SPIE. 5247, Optical Transmission Systems and Equipment for WDM Networking II

KEYWORDS: Optical components, Photodetectors, Switches, Optical amplifiers, Switching, Fiber optics, Antennas, Phased arrays, Optical networks, Network architectures

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PROCEEDINGS ARTICLE | August 19, 2003

Photonic delay lines: technology trends and challenges

Proc. SPIE. 5247, Optical Transmission Systems and Equipment for WDM Networking II

KEYWORDS: Optical fibers, Optical components, Switches, Switching, Resonators, Polarization, Antennas, Phased arrays, Phased array optics, Phase shifts

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SPIE Journal Paper | September 1, 2000

All-fiber connectorized compact fiber optic delay-line modules using three-dimensional polarization optics

Madamopoulos, Nicholas , Riza, Nabeel

OE Vol. 39 Issue 09

KEYWORDS: Polarization, Phased array optics, Collimators, Fiber optics, Fiber Bragg gratings, Switching, Switches, GRIN lenses, Single mode fibers, Gradient-index optics

SPIE Journal Paper | November 1, 1998

Photonic delay line using electrically switched gratings in polymer dispersed liquid crystals

Riza, Nabeel , Madamopoulos, Nicholas

OE Vol. 37 Issue 11

KEYWORDS: Signal to noise ratio, Liquid crystals, Polymers, Bragg cells, Switching, Modulation, Interference (communication), Diffraction, Polarization, Active optics

PROCEEDINGS ARTICLE | August 25, 1998

Photonic delay lines using polarization-selective holograms for optical signal routing

Proc. SPIE. 3388, Advances in Optical Information Processing VIII

KEYWORDS: Signal to noise ratio, Diffraction, Optical filters, Holograms, Switches, Photon polarization, Polarization, Interference (communication), Polarizers, Liquid crystals

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PROCEEDINGS ARTICLE | October 23, 1997

Switched photonic delay line for phased-array antenna control using externally modulated microwave fiber optic link

Proc. SPIE. 3160, Optical Technology for Microwave Applications VIII

KEYWORDS: Signal to noise ratio, Multimode fibers, Modulation, Fiber optics, Polarization, Signal attenuation, Single mode fibers, Optical testing, Photonic integrated circuits, Phased array optics

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PROCEEDINGS ARTICLE | October 23, 1997

Adaptable delay balanced switched photonic control modules for antenna arrays

Proc. SPIE. 3160, Optical Technology for Microwave Applications VIII

KEYWORDS: Signal to noise ratio, Optical fibers, Mirrors, Polarization, Signal attenuation, Reflectivity, Free space optics, Antennas, Phased arrays, Phased array optics

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PROCEEDINGS ARTICLE | November 5, 1996

Switched three-dimensional photonic delay line using directly modulated semiconductor lasers for microwave radar processing

Proc. SPIE. 2845, Radar Processing, Technology, and Applications

KEYWORDS: Transmitters, Modulation, Fiber optics, Polarization, Signal attenuation, Stereoscopy, Semiconductor lasers, Microwave radiation, Active optics, Phased array optics

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SPIE Journal Paper | September 1, 1996

Photonic security system using spatial codes and remote coded coherent optical communications

Riza, Nabeel , Howlader, Mostofa , Madamopoulos, Nicholas

OE Vol. 35 Issue 09

KEYWORDS: Information security, Network security, Computer security, Computer programming, Photonics systems, Signal detection, Modulation, Telecommunications, Optical communications, Transmitters

PROCEEDINGS ARTICLE | June 12, 1996

Photonic time-delay beam-forming architectures using polarization switching arrays

Proc. SPIE. 2754, Advances in Optical Information Processing VII

KEYWORDS: Optical components, Prisms, Microlens array, Switching, Polarization, Reflectivity, Multiplexing, Control systems, Antennas, Phased array optics

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PROCEEDINGS ARTICLE | April 10, 1995

Computer-generated holographic diffractive structures fabricated by direct excimer laser microetching

Proc. SPIE. 2403, Laser-Induced Thin Film Processing

KEYWORDS: Optical components, Diffraction, Holograms, Holography, Etching, Metals, Photoresist materials, Computer generated holography, Photomasks, Excimer lasers

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